| Index: src/array.js
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| diff --git a/src/array.js b/src/array.js
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| deleted file mode 100644
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| index 462e5281374689929ff2fadb8e241ff6a38ba114..0000000000000000000000000000000000000000
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| --- a/src/array.js
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| +++ /dev/null
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| @@ -1,1659 +0,0 @@
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| -// Copyright 2012 the V8 project authors. All rights reserved.
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| -// Use of this source code is governed by a BSD-style license that can be
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| -// found in the LICENSE file.
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| -
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| -(function(global, utils) {
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| -
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| -"use strict";
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| -
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| -%CheckIsBootstrapping();
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| -
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| -// -------------------------------------------------------------------
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| -// Imports
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| -
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| -var Delete;
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| -var GlobalArray = global.Array;
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| -var InternalArray = utils.InternalArray;
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| -var InternalPackedArray = utils.InternalPackedArray;
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| -var MathMin;
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| -var ObjectHasOwnProperty;
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| -var ObjectIsFrozen;
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| -var ObjectIsSealed;
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| -var ObjectToString;
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| -var unscopablesSymbol = utils.ImportNow("unscopables_symbol");
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| -
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| -utils.Import(function(from) {
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| -  Delete = from.Delete;
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| -  MathMin = from.MathMin;
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| -  ObjectHasOwnProperty = from.ObjectHasOwnProperty;
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| -  ObjectIsFrozen = from.ObjectIsFrozen;
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| -  ObjectIsSealed = from.ObjectIsSealed;
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| -  ObjectToString = from.ObjectToString;
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| -});
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| -
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| -// -------------------------------------------------------------------
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| -
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| -// Global list of arrays visited during toString, toLocaleString and
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| -// join invocations.
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| -var visited_arrays = new InternalArray();
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| -
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| -
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| -// Gets a sorted array of array keys.  Useful for operations on sparse
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| -// arrays.  Dupes have not been removed.
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| -function GetSortedArrayKeys(array, indices) {
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| -  var keys = new InternalArray();
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| -  if (IS_NUMBER(indices)) {
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| -    // It's an interval
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| -    var limit = indices;
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| -    for (var i = 0; i < limit; ++i) {
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| -      var e = array[i];
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| -      if (!IS_UNDEFINED(e) || i in array) {
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| -        keys.push(i);
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| -      }
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| -    }
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| -  } else {
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| -    var length = indices.length;
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| -    for (var k = 0; k < length; ++k) {
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| -      var key = indices[k];
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| -      if (!IS_UNDEFINED(key)) {
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| -        var e = array[key];
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| -        if (!IS_UNDEFINED(e) || key in array) {
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| -          keys.push(key);
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| -        }
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| -      }
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| -    }
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| -    keys.sort(function(a, b) { return a - b; });
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| -  }
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| -  return keys;
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| -}
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| -
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| -
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| -function SparseJoinWithSeparatorJS(array, len, convert, separator) {
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| -  var keys = GetSortedArrayKeys(array, %GetArrayKeys(array, len));
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| -  var totalLength = 0;
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| -  var elements = new InternalArray(keys.length * 2);
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| -  var previousKey = -1;
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| -  for (var i = 0; i < keys.length; i++) {
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| -    var key = keys[i];
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| -    if (key != previousKey) {  // keys may contain duplicates.
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| -      var e = array[key];
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| -      if (!IS_STRING(e)) e = convert(e);
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| -      elements[i * 2] = key;
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| -      elements[i * 2 + 1] = e;
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| -      previousKey = key;
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| -    }
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| -  }
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| -  return %SparseJoinWithSeparator(elements, len, separator);
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| -}
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| -
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| -
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| -// Optimized for sparse arrays if separator is ''.
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| -function SparseJoin(array, len, convert) {
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| -  var keys = GetSortedArrayKeys(array, %GetArrayKeys(array, len));
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| -  var last_key = -1;
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| -  var keys_length = keys.length;
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| -
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| -  var elements = new InternalArray(keys_length);
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| -  var elements_length = 0;
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| -
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| -  for (var i = 0; i < keys_length; i++) {
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| -    var key = keys[i];
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| -    if (key != last_key) {
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| -      var e = array[key];
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| -      if (!IS_STRING(e)) e = convert(e);
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| -      elements[elements_length++] = e;
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| -      last_key = key;
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| -    }
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| -  }
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| -  return %StringBuilderConcat(elements, elements_length, '');
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| -}
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| -
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| -
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| -function UseSparseVariant(array, length, is_array, touched) {
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| -  // Only use the sparse variant on arrays that are likely to be sparse and the
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| -  // number of elements touched in the operation is relatively small compared to
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| -  // the overall size of the array.
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| -  if (!is_array || length < 1000 || %IsObserved(array) ||
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| -      %HasComplexElements(array)) {
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| -    return false;
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| -  }
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| -  if (!%_IsSmi(length)) {
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| -    return true;
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| -  }
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| -  var elements_threshold = length >> 2;  // No more than 75% holes
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| -  var estimated_elements = %EstimateNumberOfElements(array);
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| -  return (estimated_elements < elements_threshold) &&
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| -    (touched > estimated_elements * 4);
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| -}
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| -
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| -
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| -function Join(array, length, separator, convert) {
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| -  if (length == 0) return '';
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| -
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| -  var is_array = IS_ARRAY(array);
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| -
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| -  if (is_array) {
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| -    // If the array is cyclic, return the empty string for already
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| -    // visited arrays.
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| -    if (!%PushIfAbsent(visited_arrays, array)) return '';
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| -  }
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| -
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| -  // Attempt to convert the elements.
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| -  try {
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| -    if (UseSparseVariant(array, length, is_array, length)) {
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| -      %NormalizeElements(array);
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| -      if (separator.length == 0) {
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| -        return SparseJoin(array, length, convert);
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| -      } else {
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| -        return SparseJoinWithSeparatorJS(array, length, convert, separator);
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| -      }
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| -    }
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| -
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| -    // Fast case for one-element arrays.
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| -    if (length == 1) {
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| -      var e = array[0];
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| -      if (IS_STRING(e)) return e;
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| -      return convert(e);
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| -    }
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| -
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| -    // Construct an array for the elements.
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| -    var elements = new InternalArray(length);
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| -
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| -    // We pull the empty separator check outside the loop for speed!
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| -    if (separator.length == 0) {
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| -      var elements_length = 0;
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| -      for (var i = 0; i < length; i++) {
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| -        var e = array[i];
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| -        if (!IS_STRING(e)) e = convert(e);
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| -        elements[elements_length++] = e;
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| -      }
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| -      elements.length = elements_length;
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| -      var result = %_FastOneByteArrayJoin(elements, '');
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| -      if (!IS_UNDEFINED(result)) return result;
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| -      return %StringBuilderConcat(elements, elements_length, '');
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| -    }
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| -    // Non-empty separator case.
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| -    // If the first element is a number then use the heuristic that the
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| -    // remaining elements are also likely to be numbers.
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| -    if (!IS_NUMBER(array[0])) {
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| -      for (var i = 0; i < length; i++) {
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| -        var e = array[i];
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| -        if (!IS_STRING(e)) e = convert(e);
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| -        elements[i] = e;
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| -      }
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| -    } else {
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| -      for (var i = 0; i < length; i++) {
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| -        var e = array[i];
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| -        if (IS_NUMBER(e)) {
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| -          e = %_NumberToString(e);
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| -        } else if (!IS_STRING(e)) {
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| -          e = convert(e);
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| -        }
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| -        elements[i] = e;
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| -      }
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| -    }
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| -    var result = %_FastOneByteArrayJoin(elements, separator);
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| -    if (!IS_UNDEFINED(result)) return result;
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| -
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| -    return %StringBuilderJoin(elements, length, separator);
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| -  } finally {
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| -    // Make sure to remove the last element of the visited array no
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| -    // matter what happens.
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| -    if (is_array) visited_arrays.length = visited_arrays.length - 1;
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| -  }
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| -}
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| -
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| -
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| -function ConvertToString(x) {
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| -  if (IS_NULL_OR_UNDEFINED(x)) {
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| -    return '';
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| -  } else {
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| -    return TO_STRING(x);
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| -  }
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| -}
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| -
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| -
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| -function ConvertToLocaleString(e) {
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| -  if (IS_NULL_OR_UNDEFINED(e)) {
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| -    return '';
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| -  } else {
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| -    return TO_STRING(e.toLocaleString());
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| -  }
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| -}
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| -
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| -
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| -// This function implements the optimized splice implementation that can use
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| -// special array operations to handle sparse arrays in a sensible fashion.
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| -function SparseSlice(array, start_i, del_count, len, deleted_elements) {
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| -  // Move deleted elements to a new array (the return value from splice).
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| -  var indices = %GetArrayKeys(array, start_i + del_count);
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| -  if (IS_NUMBER(indices)) {
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| -    var limit = indices;
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| -    for (var i = start_i; i < limit; ++i) {
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| -      var current = array[i];
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| -      if (!IS_UNDEFINED(current) || i in array) {
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| -        %AddElement(deleted_elements, i - start_i, current);
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| -      }
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| -    }
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| -  } else {
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| -    var length = indices.length;
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| -    for (var k = 0; k < length; ++k) {
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| -      var key = indices[k];
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| -      if (!IS_UNDEFINED(key)) {
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| -        if (key >= start_i) {
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| -          var current = array[key];
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| -          if (!IS_UNDEFINED(current) || key in array) {
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| -            %AddElement(deleted_elements, key - start_i, current);
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| -          }
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| -        }
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| -      }
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| -    }
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| -  }
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| -}
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| -
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| -
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| -// This function implements the optimized splice implementation that can use
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| -// special array operations to handle sparse arrays in a sensible fashion.
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| -function SparseMove(array, start_i, del_count, len, num_additional_args) {
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| -  // Bail out if no moving is necessary.
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| -  if (num_additional_args === del_count) return;
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| -  // Move data to new array.
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| -  var new_array = new InternalArray(
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| -      // Clamp array length to 2^32-1 to avoid early RangeError.
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| -      MathMin(len - del_count + num_additional_args, 0xffffffff));
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| -  var big_indices;
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| -  var indices = %GetArrayKeys(array, len);
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| -  if (IS_NUMBER(indices)) {
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| -    var limit = indices;
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| -    for (var i = 0; i < start_i && i < limit; ++i) {
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| -      var current = array[i];
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| -      if (!IS_UNDEFINED(current) || i in array) {
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| -        new_array[i] = current;
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| -      }
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| -    }
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| -    for (var i = start_i + del_count; i < limit; ++i) {
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| -      var current = array[i];
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| -      if (!IS_UNDEFINED(current) || i in array) {
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| -        new_array[i - del_count + num_additional_args] = current;
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| -      }
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| -    }
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| -  } else {
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| -    var length = indices.length;
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| -    for (var k = 0; k < length; ++k) {
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| -      var key = indices[k];
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| -      if (!IS_UNDEFINED(key)) {
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| -        if (key < start_i) {
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| -          var current = array[key];
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| -          if (!IS_UNDEFINED(current) || key in array) {
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| -            new_array[key] = current;
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| -          }
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| -        } else if (key >= start_i + del_count) {
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| -          var current = array[key];
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| -          if (!IS_UNDEFINED(current) || key in array) {
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| -            var new_key = key - del_count + num_additional_args;
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| -            new_array[new_key] = current;
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| -            if (new_key > 0xfffffffe) {
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| -              big_indices = big_indices || new InternalArray();
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| -              big_indices.push(new_key);
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| -            }
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| -          }
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| -        }
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| -      }
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| -    }
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| -  }
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| -  // Move contents of new_array into this array
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| -  %MoveArrayContents(new_array, array);
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| -  // Add any moved values that aren't elements anymore.
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| -  if (!IS_UNDEFINED(big_indices)) {
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| -    var length = big_indices.length;
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| -    for (var i = 0; i < length; ++i) {
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| -      var key = big_indices[i];
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| -      array[key] = new_array[key];
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| -    }
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| -  }
 | 
| -}
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| -
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| -
 | 
| -// This is part of the old simple-minded splice.  We are using it either
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| -// because the receiver is not an array (so we have no choice) or because we
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| -// know we are not deleting or moving a lot of elements.
 | 
| -function SimpleSlice(array, start_i, del_count, len, deleted_elements) {
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| -  var is_array = IS_ARRAY(array);
 | 
| -  for (var i = 0; i < del_count; i++) {
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| -    var index = start_i + i;
 | 
| -    if (HAS_INDEX(array, index, is_array)) {
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| -      var current = array[index];
 | 
| -      // The spec requires [[DefineOwnProperty]] here, %AddElement is close
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| -      // enough (in that it ignores the prototype).
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| -      %AddElement(deleted_elements, i, current);
 | 
| -    }
 | 
| -  }
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function SimpleMove(array, start_i, del_count, len, num_additional_args) {
 | 
| -  var is_array = IS_ARRAY(array);
 | 
| -  if (num_additional_args !== del_count) {
 | 
| -    // Move the existing elements after the elements to be deleted
 | 
| -    // to the right position in the resulting array.
 | 
| -    if (num_additional_args > del_count) {
 | 
| -      for (var i = len - del_count; i > start_i; i--) {
 | 
| -        var from_index = i + del_count - 1;
 | 
| -        var to_index = i + num_additional_args - 1;
 | 
| -        if (HAS_INDEX(array, from_index, is_array)) {
 | 
| -          array[to_index] = array[from_index];
 | 
| -        } else {
 | 
| -          delete array[to_index];
 | 
| -        }
 | 
| -      }
 | 
| -    } else {
 | 
| -      for (var i = start_i; i < len - del_count; i++) {
 | 
| -        var from_index = i + del_count;
 | 
| -        var to_index = i + num_additional_args;
 | 
| -        if (HAS_INDEX(array, from_index, is_array)) {
 | 
| -          array[to_index] = array[from_index];
 | 
| -        } else {
 | 
| -          delete array[to_index];
 | 
| -        }
 | 
| -      }
 | 
| -      for (var i = len; i > len - del_count + num_additional_args; i--) {
 | 
| -        delete array[i - 1];
 | 
| -      }
 | 
| -    }
 | 
| -  }
 | 
| -}
 | 
| -
 | 
| -
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| -// -------------------------------------------------------------------
 | 
| -
 | 
| -
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| -function ArrayToString() {
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| -  var array;
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| -  var func;
 | 
| -  if (IS_ARRAY(this)) {
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| -    func = this.join;
 | 
| -    if (func === ArrayJoin) {
 | 
| -      return Join(this, this.length, ',', ConvertToString);
 | 
| -    }
 | 
| -    array = this;
 | 
| -  } else {
 | 
| -    array = TO_OBJECT(this);
 | 
| -    func = array.join;
 | 
| -  }
 | 
| -  if (!IS_CALLABLE(func)) {
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| -    return %_CallFunction(array, ObjectToString);
 | 
| -  }
 | 
| -  return %_Call(func, array);
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function InnerArrayToLocaleString(array, length) {
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| -  var len = TO_LENGTH_OR_UINT32(length);
 | 
| -  if (len === 0) return "";
 | 
| -  return Join(array, len, ',', ConvertToLocaleString);
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function ArrayToLocaleString() {
 | 
| -  var array = TO_OBJECT(this);
 | 
| -  var arrayLen = array.length;
 | 
| -  return InnerArrayToLocaleString(array, arrayLen);
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function InnerArrayJoin(separator, array, length) {
 | 
| -  if (IS_UNDEFINED(separator)) {
 | 
| -    separator = ',';
 | 
| -  } else {
 | 
| -    separator = TO_STRING(separator);
 | 
| -  }
 | 
| -
 | 
| -  var result = %_FastOneByteArrayJoin(array, separator);
 | 
| -  if (!IS_UNDEFINED(result)) return result;
 | 
| -
 | 
| -  // Fast case for one-element arrays.
 | 
| -  if (length === 1) {
 | 
| -    var e = array[0];
 | 
| -    if (IS_NULL_OR_UNDEFINED(e)) return '';
 | 
| -    return TO_STRING(e);
 | 
| -  }
 | 
| -
 | 
| -  return Join(array, length, separator, ConvertToString);
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function ArrayJoin(separator) {
 | 
| -  CHECK_OBJECT_COERCIBLE(this, "Array.prototype.join");
 | 
| -
 | 
| -  var array = TO_OBJECT(this);
 | 
| -  var length = TO_LENGTH_OR_UINT32(array.length);
 | 
| -
 | 
| -  return InnerArrayJoin(separator, array, length);
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function ObservedArrayPop(n) {
 | 
| -  n--;
 | 
| -  var value = this[n];
 | 
| -
 | 
| -  try {
 | 
| -    $observeBeginPerformSplice(this);
 | 
| -    delete this[n];
 | 
| -    this.length = n;
 | 
| -  } finally {
 | 
| -    $observeEndPerformSplice(this);
 | 
| -    $observeEnqueueSpliceRecord(this, n, [value], 0);
 | 
| -  }
 | 
| -
 | 
| -  return value;
 | 
| -}
 | 
| -
 | 
| -
 | 
| -// Removes the last element from the array and returns it. See
 | 
| -// ECMA-262, section 15.4.4.6.
 | 
| -function ArrayPop() {
 | 
| -  CHECK_OBJECT_COERCIBLE(this, "Array.prototype.pop");
 | 
| -
 | 
| -  var array = TO_OBJECT(this);
 | 
| -  var n = TO_LENGTH_OR_UINT32(array.length);
 | 
| -  if (n == 0) {
 | 
| -    array.length = n;
 | 
| -    return;
 | 
| -  }
 | 
| -
 | 
| -  if (%IsObserved(array))
 | 
| -    return ObservedArrayPop.call(array, n);
 | 
| -
 | 
| -  n--;
 | 
| -  var value = array[n];
 | 
| -  Delete(array, n, true);
 | 
| -  array.length = n;
 | 
| -  return value;
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function ObservedArrayPush() {
 | 
| -  var n = TO_LENGTH_OR_UINT32(this.length);
 | 
| -  var m = %_ArgumentsLength();
 | 
| -
 | 
| -  try {
 | 
| -    $observeBeginPerformSplice(this);
 | 
| -    for (var i = 0; i < m; i++) {
 | 
| -      this[i+n] = %_Arguments(i);
 | 
| -    }
 | 
| -    var new_length = n + m;
 | 
| -    this.length = new_length;
 | 
| -  } finally {
 | 
| -    $observeEndPerformSplice(this);
 | 
| -    $observeEnqueueSpliceRecord(this, n, [], m);
 | 
| -  }
 | 
| -
 | 
| -  return new_length;
 | 
| -}
 | 
| -
 | 
| -
 | 
| -// Appends the arguments to the end of the array and returns the new
 | 
| -// length of the array. See ECMA-262, section 15.4.4.7.
 | 
| -function ArrayPush() {
 | 
| -  CHECK_OBJECT_COERCIBLE(this, "Array.prototype.push");
 | 
| -
 | 
| -  if (%IsObserved(this))
 | 
| -    return ObservedArrayPush.apply(this, arguments);
 | 
| -
 | 
| -  var array = TO_OBJECT(this);
 | 
| -  var n = TO_LENGTH_OR_UINT32(array.length);
 | 
| -  var m = %_ArgumentsLength();
 | 
| -
 | 
| -  for (var i = 0; i < m; i++) {
 | 
| -    array[i+n] = %_Arguments(i);
 | 
| -  }
 | 
| -
 | 
| -  var new_length = n + m;
 | 
| -  array.length = new_length;
 | 
| -  return new_length;
 | 
| -}
 | 
| -
 | 
| -
 | 
| -// For implementing reverse() on large, sparse arrays.
 | 
| -function SparseReverse(array, len) {
 | 
| -  var keys = GetSortedArrayKeys(array, %GetArrayKeys(array, len));
 | 
| -  var high_counter = keys.length - 1;
 | 
| -  var low_counter = 0;
 | 
| -  while (low_counter <= high_counter) {
 | 
| -    var i = keys[low_counter];
 | 
| -    var j = keys[high_counter];
 | 
| -
 | 
| -    var j_complement = len - j - 1;
 | 
| -    var low, high;
 | 
| -
 | 
| -    if (j_complement <= i) {
 | 
| -      high = j;
 | 
| -      while (keys[--high_counter] == j) { }
 | 
| -      low = j_complement;
 | 
| -    }
 | 
| -    if (j_complement >= i) {
 | 
| -      low = i;
 | 
| -      while (keys[++low_counter] == i) { }
 | 
| -      high = len - i - 1;
 | 
| -    }
 | 
| -
 | 
| -    var current_i = array[low];
 | 
| -    if (!IS_UNDEFINED(current_i) || low in array) {
 | 
| -      var current_j = array[high];
 | 
| -      if (!IS_UNDEFINED(current_j) || high in array) {
 | 
| -        array[low] = current_j;
 | 
| -        array[high] = current_i;
 | 
| -      } else {
 | 
| -        array[high] = current_i;
 | 
| -        delete array[low];
 | 
| -      }
 | 
| -    } else {
 | 
| -      var current_j = array[high];
 | 
| -      if (!IS_UNDEFINED(current_j) || high in array) {
 | 
| -        array[low] = current_j;
 | 
| -        delete array[high];
 | 
| -      }
 | 
| -    }
 | 
| -  }
 | 
| -}
 | 
| -
 | 
| -function PackedArrayReverse(array, len) {
 | 
| -  var j = len - 1;
 | 
| -  for (var i = 0; i < j; i++, j--) {
 | 
| -    var current_i = array[i];
 | 
| -    var current_j = array[j];
 | 
| -    array[i] = current_j;
 | 
| -    array[j] = current_i;
 | 
| -  }
 | 
| -  return array;
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function GenericArrayReverse(array, len) {
 | 
| -  var j = len - 1;
 | 
| -  for (var i = 0; i < j; i++, j--) {
 | 
| -    if (i in array) {
 | 
| -      var current_i = array[i];
 | 
| -      if (j in array) {
 | 
| -        var current_j = array[j];
 | 
| -        array[i] = current_j;
 | 
| -        array[j] = current_i;
 | 
| -      } else {
 | 
| -        array[j] = current_i;
 | 
| -        delete array[i];
 | 
| -      }
 | 
| -    } else {
 | 
| -      if (j in array) {
 | 
| -        var current_j = array[j];
 | 
| -        array[i] = current_j;
 | 
| -        delete array[j];
 | 
| -      }
 | 
| -    }
 | 
| -  }
 | 
| -  return array;
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function ArrayReverse() {
 | 
| -  CHECK_OBJECT_COERCIBLE(this, "Array.prototype.reverse");
 | 
| -
 | 
| -  var array = TO_OBJECT(this);
 | 
| -  var len = TO_LENGTH_OR_UINT32(array.length);
 | 
| -  var isArray = IS_ARRAY(array);
 | 
| -
 | 
| -  if (UseSparseVariant(array, len, isArray, len)) {
 | 
| -    %NormalizeElements(array);
 | 
| -    SparseReverse(array, len);
 | 
| -    return array;
 | 
| -  } else if (isArray && %_HasFastPackedElements(array)) {
 | 
| -    return PackedArrayReverse(array, len);
 | 
| -  } else {
 | 
| -    return GenericArrayReverse(array, len);
 | 
| -  }
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function ObservedArrayShift(len) {
 | 
| -  var first = this[0];
 | 
| -
 | 
| -  try {
 | 
| -    $observeBeginPerformSplice(this);
 | 
| -    SimpleMove(this, 0, 1, len, 0);
 | 
| -    this.length = len - 1;
 | 
| -  } finally {
 | 
| -    $observeEndPerformSplice(this);
 | 
| -    $observeEnqueueSpliceRecord(this, 0, [first], 0);
 | 
| -  }
 | 
| -
 | 
| -  return first;
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function ArrayShift() {
 | 
| -  CHECK_OBJECT_COERCIBLE(this, "Array.prototype.shift");
 | 
| -
 | 
| -  var array = TO_OBJECT(this);
 | 
| -  var len = TO_LENGTH_OR_UINT32(array.length);
 | 
| -
 | 
| -  if (len === 0) {
 | 
| -    array.length = 0;
 | 
| -    return;
 | 
| -  }
 | 
| -
 | 
| -  if (ObjectIsSealed(array)) throw MakeTypeError(kArrayFunctionsOnSealed);
 | 
| -
 | 
| -  if (%IsObserved(array))
 | 
| -    return ObservedArrayShift.call(array, len);
 | 
| -
 | 
| -  var first = array[0];
 | 
| -
 | 
| -  if (UseSparseVariant(array, len, IS_ARRAY(array), len)) {
 | 
| -    SparseMove(array, 0, 1, len, 0);
 | 
| -  } else {
 | 
| -    SimpleMove(array, 0, 1, len, 0);
 | 
| -  }
 | 
| -
 | 
| -  array.length = len - 1;
 | 
| -
 | 
| -  return first;
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function ObservedArrayUnshift() {
 | 
| -  var len = TO_LENGTH_OR_UINT32(this.length);
 | 
| -  var num_arguments = %_ArgumentsLength();
 | 
| -
 | 
| -  try {
 | 
| -    $observeBeginPerformSplice(this);
 | 
| -    SimpleMove(this, 0, 0, len, num_arguments);
 | 
| -    for (var i = 0; i < num_arguments; i++) {
 | 
| -      this[i] = %_Arguments(i);
 | 
| -    }
 | 
| -    var new_length = len + num_arguments;
 | 
| -    this.length = new_length;
 | 
| -  } finally {
 | 
| -    $observeEndPerformSplice(this);
 | 
| -    $observeEnqueueSpliceRecord(this, 0, [], num_arguments);
 | 
| -  }
 | 
| -
 | 
| -  return new_length;
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function ArrayUnshift(arg1) {  // length == 1
 | 
| -  CHECK_OBJECT_COERCIBLE(this, "Array.prototype.unshift");
 | 
| -
 | 
| -  if (%IsObserved(this))
 | 
| -    return ObservedArrayUnshift.apply(this, arguments);
 | 
| -
 | 
| -  var array = TO_OBJECT(this);
 | 
| -  var len = TO_LENGTH_OR_UINT32(array.length);
 | 
| -  var num_arguments = %_ArgumentsLength();
 | 
| -
 | 
| -  if (len > 0 && UseSparseVariant(array, len, IS_ARRAY(array), len) &&
 | 
| -      !ObjectIsSealed(array)) {
 | 
| -    SparseMove(array, 0, 0, len, num_arguments);
 | 
| -  } else {
 | 
| -    SimpleMove(array, 0, 0, len, num_arguments);
 | 
| -  }
 | 
| -
 | 
| -  for (var i = 0; i < num_arguments; i++) {
 | 
| -    array[i] = %_Arguments(i);
 | 
| -  }
 | 
| -
 | 
| -  var new_length = len + num_arguments;
 | 
| -  array.length = new_length;
 | 
| -  return new_length;
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function ArraySlice(start, end) {
 | 
| -  CHECK_OBJECT_COERCIBLE(this, "Array.prototype.slice");
 | 
| -
 | 
| -  var array = TO_OBJECT(this);
 | 
| -  var len = TO_LENGTH_OR_UINT32(array.length);
 | 
| -  var start_i = TO_INTEGER(start);
 | 
| -  var end_i = len;
 | 
| -
 | 
| -  if (!IS_UNDEFINED(end)) end_i = TO_INTEGER(end);
 | 
| -
 | 
| -  if (start_i < 0) {
 | 
| -    start_i += len;
 | 
| -    if (start_i < 0) start_i = 0;
 | 
| -  } else {
 | 
| -    if (start_i > len) start_i = len;
 | 
| -  }
 | 
| -
 | 
| -  if (end_i < 0) {
 | 
| -    end_i += len;
 | 
| -    if (end_i < 0) end_i = 0;
 | 
| -  } else {
 | 
| -    if (end_i > len) end_i = len;
 | 
| -  }
 | 
| -
 | 
| -  var result = [];
 | 
| -
 | 
| -  if (end_i < start_i) return result;
 | 
| -
 | 
| -  if (UseSparseVariant(array, len, IS_ARRAY(array), end_i - start_i)) {
 | 
| -    %NormalizeElements(array);
 | 
| -    %NormalizeElements(result);
 | 
| -    SparseSlice(array, start_i, end_i - start_i, len, result);
 | 
| -  } else {
 | 
| -    SimpleSlice(array, start_i, end_i - start_i, len, result);
 | 
| -  }
 | 
| -
 | 
| -  result.length = end_i - start_i;
 | 
| -
 | 
| -  return result;
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function ComputeSpliceStartIndex(start_i, len) {
 | 
| -  if (start_i < 0) {
 | 
| -    start_i += len;
 | 
| -    return start_i < 0 ? 0 : start_i;
 | 
| -  }
 | 
| -
 | 
| -  return start_i > len ? len : start_i;
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function ComputeSpliceDeleteCount(delete_count, num_arguments, len, start_i) {
 | 
| -  // SpiderMonkey, TraceMonkey and JSC treat the case where no delete count is
 | 
| -  // given as a request to delete all the elements from the start.
 | 
| -  // And it differs from the case of undefined delete count.
 | 
| -  // This does not follow ECMA-262, but we do the same for
 | 
| -  // compatibility.
 | 
| -  var del_count = 0;
 | 
| -  if (num_arguments == 1)
 | 
| -    return len - start_i;
 | 
| -
 | 
| -  del_count = TO_INTEGER(delete_count);
 | 
| -  if (del_count < 0)
 | 
| -    return 0;
 | 
| -
 | 
| -  if (del_count > len - start_i)
 | 
| -    return len - start_i;
 | 
| -
 | 
| -  return del_count;
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function ObservedArraySplice(start, delete_count) {
 | 
| -  var num_arguments = %_ArgumentsLength();
 | 
| -  var len = TO_LENGTH_OR_UINT32(this.length);
 | 
| -  var start_i = ComputeSpliceStartIndex(TO_INTEGER(start), len);
 | 
| -  var del_count = ComputeSpliceDeleteCount(delete_count, num_arguments, len,
 | 
| -                                           start_i);
 | 
| -  var deleted_elements = [];
 | 
| -  deleted_elements.length = del_count;
 | 
| -  var num_elements_to_add = num_arguments > 2 ? num_arguments - 2 : 0;
 | 
| -
 | 
| -  try {
 | 
| -    $observeBeginPerformSplice(this);
 | 
| -
 | 
| -    SimpleSlice(this, start_i, del_count, len, deleted_elements);
 | 
| -    SimpleMove(this, start_i, del_count, len, num_elements_to_add);
 | 
| -
 | 
| -    // Insert the arguments into the resulting array in
 | 
| -    // place of the deleted elements.
 | 
| -    var i = start_i;
 | 
| -    var arguments_index = 2;
 | 
| -    var arguments_length = %_ArgumentsLength();
 | 
| -    while (arguments_index < arguments_length) {
 | 
| -      this[i++] = %_Arguments(arguments_index++);
 | 
| -    }
 | 
| -    this.length = len - del_count + num_elements_to_add;
 | 
| -
 | 
| -  } finally {
 | 
| -    $observeEndPerformSplice(this);
 | 
| -    if (deleted_elements.length || num_elements_to_add) {
 | 
| -      $observeEnqueueSpliceRecord(this,
 | 
| -                                  start_i,
 | 
| -                                  deleted_elements.slice(),
 | 
| -                                  num_elements_to_add);
 | 
| -    }
 | 
| -  }
 | 
| -
 | 
| -  // Return the deleted elements.
 | 
| -  return deleted_elements;
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function ArraySplice(start, delete_count) {
 | 
| -  CHECK_OBJECT_COERCIBLE(this, "Array.prototype.splice");
 | 
| -
 | 
| -  if (%IsObserved(this))
 | 
| -    return ObservedArraySplice.apply(this, arguments);
 | 
| -
 | 
| -  var num_arguments = %_ArgumentsLength();
 | 
| -  var array = TO_OBJECT(this);
 | 
| -  var len = TO_LENGTH_OR_UINT32(array.length);
 | 
| -  var start_i = ComputeSpliceStartIndex(TO_INTEGER(start), len);
 | 
| -  var del_count = ComputeSpliceDeleteCount(delete_count, num_arguments, len,
 | 
| -                                           start_i);
 | 
| -  var deleted_elements = [];
 | 
| -  deleted_elements.length = del_count;
 | 
| -  var num_elements_to_add = num_arguments > 2 ? num_arguments - 2 : 0;
 | 
| -
 | 
| -  if (del_count != num_elements_to_add && ObjectIsSealed(array)) {
 | 
| -    throw MakeTypeError(kArrayFunctionsOnSealed);
 | 
| -  } else if (del_count > 0 && ObjectIsFrozen(array)) {
 | 
| -    throw MakeTypeError(kArrayFunctionsOnFrozen);
 | 
| -  }
 | 
| -
 | 
| -  var changed_elements = del_count;
 | 
| -  if (num_elements_to_add != del_count) {
 | 
| -    // If the slice needs to do a actually move elements after the insertion
 | 
| -    // point, then include those in the estimate of changed elements.
 | 
| -    changed_elements += len - start_i - del_count;
 | 
| -  }
 | 
| -  if (UseSparseVariant(array, len, IS_ARRAY(array), changed_elements)) {
 | 
| -    %NormalizeElements(array);
 | 
| -    %NormalizeElements(deleted_elements);
 | 
| -    SparseSlice(array, start_i, del_count, len, deleted_elements);
 | 
| -    SparseMove(array, start_i, del_count, len, num_elements_to_add);
 | 
| -  } else {
 | 
| -    SimpleSlice(array, start_i, del_count, len, deleted_elements);
 | 
| -    SimpleMove(array, start_i, del_count, len, num_elements_to_add);
 | 
| -  }
 | 
| -
 | 
| -  // Insert the arguments into the resulting array in
 | 
| -  // place of the deleted elements.
 | 
| -  var i = start_i;
 | 
| -  var arguments_index = 2;
 | 
| -  var arguments_length = %_ArgumentsLength();
 | 
| -  while (arguments_index < arguments_length) {
 | 
| -    array[i++] = %_Arguments(arguments_index++);
 | 
| -  }
 | 
| -  array.length = len - del_count + num_elements_to_add;
 | 
| -
 | 
| -  // Return the deleted elements.
 | 
| -  return deleted_elements;
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function InnerArraySort(array, length, comparefn) {
 | 
| -  // In-place QuickSort algorithm.
 | 
| -  // For short (length <= 22) arrays, insertion sort is used for efficiency.
 | 
| -
 | 
| -  if (!IS_CALLABLE(comparefn)) {
 | 
| -    comparefn = function (x, y) {
 | 
| -      if (x === y) return 0;
 | 
| -      if (%_IsSmi(x) && %_IsSmi(y)) {
 | 
| -        return %SmiLexicographicCompare(x, y);
 | 
| -      }
 | 
| -      x = TO_STRING(x);
 | 
| -      y = TO_STRING(y);
 | 
| -      if (x == y) return 0;
 | 
| -      else return x < y ? -1 : 1;
 | 
| -    };
 | 
| -  }
 | 
| -  var InsertionSort = function InsertionSort(a, from, to) {
 | 
| -    for (var i = from + 1; i < to; i++) {
 | 
| -      var element = a[i];
 | 
| -      for (var j = i - 1; j >= from; j--) {
 | 
| -        var tmp = a[j];
 | 
| -        var order = comparefn(tmp, element);
 | 
| -        if (order > 0) {
 | 
| -          a[j + 1] = tmp;
 | 
| -        } else {
 | 
| -          break;
 | 
| -        }
 | 
| -      }
 | 
| -      a[j + 1] = element;
 | 
| -    }
 | 
| -  };
 | 
| -
 | 
| -  var GetThirdIndex = function(a, from, to) {
 | 
| -    var t_array = new InternalArray();
 | 
| -    // Use both 'from' and 'to' to determine the pivot candidates.
 | 
| -    var increment = 200 + ((to - from) & 15);
 | 
| -    var j = 0;
 | 
| -    from += 1;
 | 
| -    to -= 1;
 | 
| -    for (var i = from; i < to; i += increment) {
 | 
| -      t_array[j] = [i, a[i]];
 | 
| -      j++;
 | 
| -    }
 | 
| -    t_array.sort(function(a, b) {
 | 
| -      return comparefn(a[1], b[1]);
 | 
| -    });
 | 
| -    var third_index = t_array[t_array.length >> 1][0];
 | 
| -    return third_index;
 | 
| -  }
 | 
| -
 | 
| -  var QuickSort = function QuickSort(a, from, to) {
 | 
| -    var third_index = 0;
 | 
| -    while (true) {
 | 
| -      // Insertion sort is faster for short arrays.
 | 
| -      if (to - from <= 10) {
 | 
| -        InsertionSort(a, from, to);
 | 
| -        return;
 | 
| -      }
 | 
| -      if (to - from > 1000) {
 | 
| -        third_index = GetThirdIndex(a, from, to);
 | 
| -      } else {
 | 
| -        third_index = from + ((to - from) >> 1);
 | 
| -      }
 | 
| -      // Find a pivot as the median of first, last and middle element.
 | 
| -      var v0 = a[from];
 | 
| -      var v1 = a[to - 1];
 | 
| -      var v2 = a[third_index];
 | 
| -      var c01 = comparefn(v0, v1);
 | 
| -      if (c01 > 0) {
 | 
| -        // v1 < v0, so swap them.
 | 
| -        var tmp = v0;
 | 
| -        v0 = v1;
 | 
| -        v1 = tmp;
 | 
| -      } // v0 <= v1.
 | 
| -      var c02 = comparefn(v0, v2);
 | 
| -      if (c02 >= 0) {
 | 
| -        // v2 <= v0 <= v1.
 | 
| -        var tmp = v0;
 | 
| -        v0 = v2;
 | 
| -        v2 = v1;
 | 
| -        v1 = tmp;
 | 
| -      } else {
 | 
| -        // v0 <= v1 && v0 < v2
 | 
| -        var c12 = comparefn(v1, v2);
 | 
| -        if (c12 > 0) {
 | 
| -          // v0 <= v2 < v1
 | 
| -          var tmp = v1;
 | 
| -          v1 = v2;
 | 
| -          v2 = tmp;
 | 
| -        }
 | 
| -      }
 | 
| -      // v0 <= v1 <= v2
 | 
| -      a[from] = v0;
 | 
| -      a[to - 1] = v2;
 | 
| -      var pivot = v1;
 | 
| -      var low_end = from + 1;   // Upper bound of elements lower than pivot.
 | 
| -      var high_start = to - 1;  // Lower bound of elements greater than pivot.
 | 
| -      a[third_index] = a[low_end];
 | 
| -      a[low_end] = pivot;
 | 
| -
 | 
| -      // From low_end to i are elements equal to pivot.
 | 
| -      // From i to high_start are elements that haven't been compared yet.
 | 
| -      partition: for (var i = low_end + 1; i < high_start; i++) {
 | 
| -        var element = a[i];
 | 
| -        var order = comparefn(element, pivot);
 | 
| -        if (order < 0) {
 | 
| -          a[i] = a[low_end];
 | 
| -          a[low_end] = element;
 | 
| -          low_end++;
 | 
| -        } else if (order > 0) {
 | 
| -          do {
 | 
| -            high_start--;
 | 
| -            if (high_start == i) break partition;
 | 
| -            var top_elem = a[high_start];
 | 
| -            order = comparefn(top_elem, pivot);
 | 
| -          } while (order > 0);
 | 
| -          a[i] = a[high_start];
 | 
| -          a[high_start] = element;
 | 
| -          if (order < 0) {
 | 
| -            element = a[i];
 | 
| -            a[i] = a[low_end];
 | 
| -            a[low_end] = element;
 | 
| -            low_end++;
 | 
| -          }
 | 
| -        }
 | 
| -      }
 | 
| -      if (to - high_start < low_end - from) {
 | 
| -        QuickSort(a, high_start, to);
 | 
| -        to = low_end;
 | 
| -      } else {
 | 
| -        QuickSort(a, from, low_end);
 | 
| -        from = high_start;
 | 
| -      }
 | 
| -    }
 | 
| -  };
 | 
| -
 | 
| -  // Copy elements in the range 0..length from obj's prototype chain
 | 
| -  // to obj itself, if obj has holes. Return one more than the maximal index
 | 
| -  // of a prototype property.
 | 
| -  var CopyFromPrototype = function CopyFromPrototype(obj, length) {
 | 
| -    var max = 0;
 | 
| -    for (var proto = %_GetPrototype(obj); proto; proto = %_GetPrototype(proto)) {
 | 
| -      var indices = %GetArrayKeys(proto, length);
 | 
| -      if (IS_NUMBER(indices)) {
 | 
| -        // It's an interval.
 | 
| -        var proto_length = indices;
 | 
| -        for (var i = 0; i < proto_length; i++) {
 | 
| -          if (!HAS_OWN_PROPERTY(obj, i) && HAS_OWN_PROPERTY(proto, i)) {
 | 
| -            obj[i] = proto[i];
 | 
| -            if (i >= max) { max = i + 1; }
 | 
| -          }
 | 
| -        }
 | 
| -      } else {
 | 
| -        for (var i = 0; i < indices.length; i++) {
 | 
| -          var index = indices[i];
 | 
| -          if (!IS_UNDEFINED(index) && !HAS_OWN_PROPERTY(obj, index)
 | 
| -              && HAS_OWN_PROPERTY(proto, index)) {
 | 
| -            obj[index] = proto[index];
 | 
| -            if (index >= max) { max = index + 1; }
 | 
| -          }
 | 
| -        }
 | 
| -      }
 | 
| -    }
 | 
| -    return max;
 | 
| -  };
 | 
| -
 | 
| -  // Set a value of "undefined" on all indices in the range from..to
 | 
| -  // where a prototype of obj has an element. I.e., shadow all prototype
 | 
| -  // elements in that range.
 | 
| -  var ShadowPrototypeElements = function(obj, from, to) {
 | 
| -    for (var proto = %_GetPrototype(obj); proto; proto = %_GetPrototype(proto)) {
 | 
| -      var indices = %GetArrayKeys(proto, to);
 | 
| -      if (IS_NUMBER(indices)) {
 | 
| -        // It's an interval.
 | 
| -        var proto_length = indices;
 | 
| -        for (var i = from; i < proto_length; i++) {
 | 
| -          if (HAS_OWN_PROPERTY(proto, i)) {
 | 
| -            obj[i] = UNDEFINED;
 | 
| -          }
 | 
| -        }
 | 
| -      } else {
 | 
| -        for (var i = 0; i < indices.length; i++) {
 | 
| -          var index = indices[i];
 | 
| -          if (!IS_UNDEFINED(index) && from <= index &&
 | 
| -              HAS_OWN_PROPERTY(proto, index)) {
 | 
| -            obj[index] = UNDEFINED;
 | 
| -          }
 | 
| -        }
 | 
| -      }
 | 
| -    }
 | 
| -  };
 | 
| -
 | 
| -  var SafeRemoveArrayHoles = function SafeRemoveArrayHoles(obj) {
 | 
| -    // Copy defined elements from the end to fill in all holes and undefineds
 | 
| -    // in the beginning of the array.  Write undefineds and holes at the end
 | 
| -    // after loop is finished.
 | 
| -    var first_undefined = 0;
 | 
| -    var last_defined = length - 1;
 | 
| -    var num_holes = 0;
 | 
| -    while (first_undefined < last_defined) {
 | 
| -      // Find first undefined element.
 | 
| -      while (first_undefined < last_defined &&
 | 
| -             !IS_UNDEFINED(obj[first_undefined])) {
 | 
| -        first_undefined++;
 | 
| -      }
 | 
| -      // Maintain the invariant num_holes = the number of holes in the original
 | 
| -      // array with indices <= first_undefined or > last_defined.
 | 
| -      if (!HAS_OWN_PROPERTY(obj, first_undefined)) {
 | 
| -        num_holes++;
 | 
| -      }
 | 
| -
 | 
| -      // Find last defined element.
 | 
| -      while (first_undefined < last_defined &&
 | 
| -             IS_UNDEFINED(obj[last_defined])) {
 | 
| -        if (!HAS_OWN_PROPERTY(obj, last_defined)) {
 | 
| -          num_holes++;
 | 
| -        }
 | 
| -        last_defined--;
 | 
| -      }
 | 
| -      if (first_undefined < last_defined) {
 | 
| -        // Fill in hole or undefined.
 | 
| -        obj[first_undefined] = obj[last_defined];
 | 
| -        obj[last_defined] = UNDEFINED;
 | 
| -      }
 | 
| -    }
 | 
| -    // If there were any undefineds in the entire array, first_undefined
 | 
| -    // points to one past the last defined element.  Make this true if
 | 
| -    // there were no undefineds, as well, so that first_undefined == number
 | 
| -    // of defined elements.
 | 
| -    if (!IS_UNDEFINED(obj[first_undefined])) first_undefined++;
 | 
| -    // Fill in the undefineds and the holes.  There may be a hole where
 | 
| -    // an undefined should be and vice versa.
 | 
| -    var i;
 | 
| -    for (i = first_undefined; i < length - num_holes; i++) {
 | 
| -      obj[i] = UNDEFINED;
 | 
| -    }
 | 
| -    for (i = length - num_holes; i < length; i++) {
 | 
| -      // For compatability with Webkit, do not expose elements in the prototype.
 | 
| -      if (i in %_GetPrototype(obj)) {
 | 
| -        obj[i] = UNDEFINED;
 | 
| -      } else {
 | 
| -        delete obj[i];
 | 
| -      }
 | 
| -    }
 | 
| -
 | 
| -    // Return the number of defined elements.
 | 
| -    return first_undefined;
 | 
| -  };
 | 
| -
 | 
| -  if (length < 2) return array;
 | 
| -
 | 
| -  var is_array = IS_ARRAY(array);
 | 
| -  var max_prototype_element;
 | 
| -  if (!is_array) {
 | 
| -    // For compatibility with JSC, we also sort elements inherited from
 | 
| -    // the prototype chain on non-Array objects.
 | 
| -    // We do this by copying them to this object and sorting only
 | 
| -    // own elements. This is not very efficient, but sorting with
 | 
| -    // inherited elements happens very, very rarely, if at all.
 | 
| -    // The specification allows "implementation dependent" behavior
 | 
| -    // if an element on the prototype chain has an element that
 | 
| -    // might interact with sorting.
 | 
| -    max_prototype_element = CopyFromPrototype(array, length);
 | 
| -  }
 | 
| -
 | 
| -  // %RemoveArrayHoles returns -1 if fast removal is not supported.
 | 
| -  var num_non_undefined = %RemoveArrayHoles(array, length);
 | 
| -
 | 
| -  if (num_non_undefined == -1) {
 | 
| -    // The array is observed, or there were indexed accessors in the array.
 | 
| -    // Move array holes and undefineds to the end using a Javascript function
 | 
| -    // that is safe in the presence of accessors and is observable.
 | 
| -    num_non_undefined = SafeRemoveArrayHoles(array);
 | 
| -  }
 | 
| -
 | 
| -  QuickSort(array, 0, num_non_undefined);
 | 
| -
 | 
| -  if (!is_array && (num_non_undefined + 1 < max_prototype_element)) {
 | 
| -    // For compatibility with JSC, we shadow any elements in the prototype
 | 
| -    // chain that has become exposed by sort moving a hole to its position.
 | 
| -    ShadowPrototypeElements(array, num_non_undefined, max_prototype_element);
 | 
| -  }
 | 
| -
 | 
| -  return array;
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function ArraySort(comparefn) {
 | 
| -  CHECK_OBJECT_COERCIBLE(this, "Array.prototype.sort");
 | 
| -
 | 
| -  var array = TO_OBJECT(this);
 | 
| -  var length = TO_LENGTH_OR_UINT32(array.length);
 | 
| -  return InnerArraySort(array, length, comparefn);
 | 
| -}
 | 
| -
 | 
| -
 | 
| -// The following functions cannot be made efficient on sparse arrays while
 | 
| -// preserving the semantics, since the calls to the receiver function can add
 | 
| -// or delete elements from the array.
 | 
| -function InnerArrayFilter(f, receiver, array, length) {
 | 
| -  if (!IS_CALLABLE(f)) throw MakeTypeError(kCalledNonCallable, f);
 | 
| -
 | 
| -  var accumulator = new InternalArray();
 | 
| -  var accumulator_length = 0;
 | 
| -  var is_array = IS_ARRAY(array);
 | 
| -  var stepping = DEBUG_IS_ACTIVE && %DebugCallbackSupportsStepping(f);
 | 
| -  for (var i = 0; i < length; i++) {
 | 
| -    if (HAS_INDEX(array, i, is_array)) {
 | 
| -      var element = array[i];
 | 
| -      // Prepare break slots for debugger step in.
 | 
| -      if (stepping) %DebugPrepareStepInIfStepping(f);
 | 
| -      if (%_Call(f, receiver, element, i, array)) {
 | 
| -        accumulator[accumulator_length++] = element;
 | 
| -      }
 | 
| -    }
 | 
| -  }
 | 
| -  return accumulator;
 | 
| -}
 | 
| -
 | 
| -function ArrayFilter(f, receiver) {
 | 
| -  CHECK_OBJECT_COERCIBLE(this, "Array.prototype.filter");
 | 
| -
 | 
| -  // Pull out the length so that modifications to the length in the
 | 
| -  // loop will not affect the looping and side effects are visible.
 | 
| -  var array = TO_OBJECT(this);
 | 
| -  var length = TO_LENGTH_OR_UINT32(array.length);
 | 
| -  var accumulator = InnerArrayFilter(f, receiver, array, length);
 | 
| -  var result = new GlobalArray();
 | 
| -  %MoveArrayContents(accumulator, result);
 | 
| -  return result;
 | 
| -}
 | 
| -
 | 
| -function InnerArrayForEach(f, receiver, array, length) {
 | 
| -  if (!IS_CALLABLE(f)) throw MakeTypeError(kCalledNonCallable, f);
 | 
| -
 | 
| -  var is_array = IS_ARRAY(array);
 | 
| -  var stepping = DEBUG_IS_ACTIVE && %DebugCallbackSupportsStepping(f);
 | 
| -  for (var i = 0; i < length; i++) {
 | 
| -    if (HAS_INDEX(array, i, is_array)) {
 | 
| -      var element = array[i];
 | 
| -      // Prepare break slots for debugger step in.
 | 
| -      if (stepping) %DebugPrepareStepInIfStepping(f);
 | 
| -      %_Call(f, receiver, element, i, array);
 | 
| -    }
 | 
| -  }
 | 
| -}
 | 
| -
 | 
| -function ArrayForEach(f, receiver) {
 | 
| -  CHECK_OBJECT_COERCIBLE(this, "Array.prototype.forEach");
 | 
| -
 | 
| -  // Pull out the length so that modifications to the length in the
 | 
| -  // loop will not affect the looping and side effects are visible.
 | 
| -  var array = TO_OBJECT(this);
 | 
| -  var length = TO_LENGTH_OR_UINT32(array.length);
 | 
| -  InnerArrayForEach(f, receiver, array, length);
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function InnerArraySome(f, receiver, array, length) {
 | 
| -  if (!IS_CALLABLE(f)) throw MakeTypeError(kCalledNonCallable, f);
 | 
| -
 | 
| -  var is_array = IS_ARRAY(array);
 | 
| -  var stepping = DEBUG_IS_ACTIVE && %DebugCallbackSupportsStepping(f);
 | 
| -  for (var i = 0; i < length; i++) {
 | 
| -    if (HAS_INDEX(array, i, is_array)) {
 | 
| -      var element = array[i];
 | 
| -      // Prepare break slots for debugger step in.
 | 
| -      if (stepping) %DebugPrepareStepInIfStepping(f);
 | 
| -      if (%_Call(f, receiver, element, i, array)) return true;
 | 
| -    }
 | 
| -  }
 | 
| -  return false;
 | 
| -}
 | 
| -
 | 
| -
 | 
| -// Executes the function once for each element present in the
 | 
| -// array until it finds one where callback returns true.
 | 
| -function ArraySome(f, receiver) {
 | 
| -  CHECK_OBJECT_COERCIBLE(this, "Array.prototype.some");
 | 
| -
 | 
| -  // Pull out the length so that modifications to the length in the
 | 
| -  // loop will not affect the looping and side effects are visible.
 | 
| -  var array = TO_OBJECT(this);
 | 
| -  var length = TO_LENGTH_OR_UINT32(array.length);
 | 
| -  return InnerArraySome(f, receiver, array, length);
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function InnerArrayEvery(f, receiver, array, length) {
 | 
| -  if (!IS_CALLABLE(f)) throw MakeTypeError(kCalledNonCallable, f);
 | 
| -
 | 
| -  var is_array = IS_ARRAY(array);
 | 
| -  var stepping = DEBUG_IS_ACTIVE && %DebugCallbackSupportsStepping(f);
 | 
| -  for (var i = 0; i < length; i++) {
 | 
| -    if (HAS_INDEX(array, i, is_array)) {
 | 
| -      var element = array[i];
 | 
| -      // Prepare break slots for debugger step in.
 | 
| -      if (stepping) %DebugPrepareStepInIfStepping(f);
 | 
| -      if (!%_Call(f, receiver, element, i, array)) return false;
 | 
| -    }
 | 
| -  }
 | 
| -  return true;
 | 
| -}
 | 
| -
 | 
| -function ArrayEvery(f, receiver) {
 | 
| -  CHECK_OBJECT_COERCIBLE(this, "Array.prototype.every");
 | 
| -
 | 
| -  // Pull out the length so that modifications to the length in the
 | 
| -  // loop will not affect the looping and side effects are visible.
 | 
| -  var array = TO_OBJECT(this);
 | 
| -  var length = TO_LENGTH_OR_UINT32(array.length);
 | 
| -  return InnerArrayEvery(f, receiver, array, length);
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function InnerArrayMap(f, receiver, array, length) {
 | 
| -  if (!IS_CALLABLE(f)) throw MakeTypeError(kCalledNonCallable, f);
 | 
| -
 | 
| -  var accumulator = new InternalArray(length);
 | 
| -  var is_array = IS_ARRAY(array);
 | 
| -  var stepping = DEBUG_IS_ACTIVE && %DebugCallbackSupportsStepping(f);
 | 
| -  for (var i = 0; i < length; i++) {
 | 
| -    if (HAS_INDEX(array, i, is_array)) {
 | 
| -      var element = array[i];
 | 
| -      // Prepare break slots for debugger step in.
 | 
| -      if (stepping) %DebugPrepareStepInIfStepping(f);
 | 
| -      accumulator[i] = %_Call(f, receiver, element, i, array);
 | 
| -    }
 | 
| -  }
 | 
| -  return accumulator;
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function ArrayMap(f, receiver) {
 | 
| -  CHECK_OBJECT_COERCIBLE(this, "Array.prototype.map");
 | 
| -
 | 
| -  // Pull out the length so that modifications to the length in the
 | 
| -  // loop will not affect the looping and side effects are visible.
 | 
| -  var array = TO_OBJECT(this);
 | 
| -  var length = TO_LENGTH_OR_UINT32(array.length);
 | 
| -  var accumulator = InnerArrayMap(f, receiver, array, length);
 | 
| -  var result = new GlobalArray();
 | 
| -  %MoveArrayContents(accumulator, result);
 | 
| -  return result;
 | 
| -}
 | 
| -
 | 
| -
 | 
| -// For .indexOf, we don't need to pass in the number of arguments
 | 
| -// at the callsite since ToInteger(undefined) == 0; however, for
 | 
| -// .lastIndexOf, we need to pass it, since the behavior for passing
 | 
| -// undefined is 0 but for not including the argument is length-1.
 | 
| -function InnerArrayIndexOf(array, element, index, length) {
 | 
| -  if (length == 0) return -1;
 | 
| -  if (IS_UNDEFINED(index)) {
 | 
| -    index = 0;
 | 
| -  } else {
 | 
| -    index = TO_INTEGER(index);
 | 
| -    // If index is negative, index from the end of the array.
 | 
| -    if (index < 0) {
 | 
| -      index = length + index;
 | 
| -      // If index is still negative, search the entire array.
 | 
| -      if (index < 0) index = 0;
 | 
| -    }
 | 
| -  }
 | 
| -  var min = index;
 | 
| -  var max = length;
 | 
| -  if (UseSparseVariant(array, length, IS_ARRAY(array), max - min)) {
 | 
| -    %NormalizeElements(array);
 | 
| -    var indices = %GetArrayKeys(array, length);
 | 
| -    if (IS_NUMBER(indices)) {
 | 
| -      // It's an interval.
 | 
| -      max = indices;  // Capped by length already.
 | 
| -      // Fall through to loop below.
 | 
| -    } else {
 | 
| -      if (indices.length == 0) return -1;
 | 
| -      // Get all the keys in sorted order.
 | 
| -      var sortedKeys = GetSortedArrayKeys(array, indices);
 | 
| -      var n = sortedKeys.length;
 | 
| -      var i = 0;
 | 
| -      while (i < n && sortedKeys[i] < index) i++;
 | 
| -      while (i < n) {
 | 
| -        var key = sortedKeys[i];
 | 
| -        if (!IS_UNDEFINED(key) && array[key] === element) return key;
 | 
| -        i++;
 | 
| -      }
 | 
| -      return -1;
 | 
| -    }
 | 
| -  }
 | 
| -  // Lookup through the array.
 | 
| -  if (!IS_UNDEFINED(element)) {
 | 
| -    for (var i = min; i < max; i++) {
 | 
| -      if (array[i] === element) return i;
 | 
| -    }
 | 
| -    return -1;
 | 
| -  }
 | 
| -  // Lookup through the array.
 | 
| -  for (var i = min; i < max; i++) {
 | 
| -    if (IS_UNDEFINED(array[i]) && i in array) {
 | 
| -      return i;
 | 
| -    }
 | 
| -  }
 | 
| -  return -1;
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function ArrayIndexOf(element, index) {
 | 
| -  CHECK_OBJECT_COERCIBLE(this, "Array.prototype.indexOf");
 | 
| -
 | 
| -  var length = TO_LENGTH_OR_UINT32(this.length);
 | 
| -  return InnerArrayIndexOf(this, element, index, length);
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function InnerArrayLastIndexOf(array, element, index, length, argumentsLength) {
 | 
| -  if (length == 0) return -1;
 | 
| -  if (argumentsLength < 2) {
 | 
| -    index = length - 1;
 | 
| -  } else {
 | 
| -    index = TO_INTEGER(index);
 | 
| -    // If index is negative, index from end of the array.
 | 
| -    if (index < 0) index += length;
 | 
| -    // If index is still negative, do not search the array.
 | 
| -    if (index < 0) return -1;
 | 
| -    else if (index >= length) index = length - 1;
 | 
| -  }
 | 
| -  var min = 0;
 | 
| -  var max = index;
 | 
| -  if (UseSparseVariant(array, length, IS_ARRAY(array), index)) {
 | 
| -    %NormalizeElements(array);
 | 
| -    var indices = %GetArrayKeys(array, index + 1);
 | 
| -    if (IS_NUMBER(indices)) {
 | 
| -      // It's an interval.
 | 
| -      max = indices;  // Capped by index already.
 | 
| -      // Fall through to loop below.
 | 
| -    } else {
 | 
| -      if (indices.length == 0) return -1;
 | 
| -      // Get all the keys in sorted order.
 | 
| -      var sortedKeys = GetSortedArrayKeys(array, indices);
 | 
| -      var i = sortedKeys.length - 1;
 | 
| -      while (i >= 0) {
 | 
| -        var key = sortedKeys[i];
 | 
| -        if (!IS_UNDEFINED(key) && array[key] === element) return key;
 | 
| -        i--;
 | 
| -      }
 | 
| -      return -1;
 | 
| -    }
 | 
| -  }
 | 
| -  // Lookup through the array.
 | 
| -  if (!IS_UNDEFINED(element)) {
 | 
| -    for (var i = max; i >= min; i--) {
 | 
| -      if (array[i] === element) return i;
 | 
| -    }
 | 
| -    return -1;
 | 
| -  }
 | 
| -  for (var i = max; i >= min; i--) {
 | 
| -    if (IS_UNDEFINED(array[i]) && i in array) {
 | 
| -      return i;
 | 
| -    }
 | 
| -  }
 | 
| -  return -1;
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function ArrayLastIndexOf(element, index) {
 | 
| -  CHECK_OBJECT_COERCIBLE(this, "Array.prototype.lastIndexOf");
 | 
| -
 | 
| -  var length = TO_LENGTH_OR_UINT32(this.length);
 | 
| -  return InnerArrayLastIndexOf(this, element, index, length,
 | 
| -                        %_ArgumentsLength());
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function InnerArrayReduce(callback, current, array, length, argumentsLength) {
 | 
| -  if (!IS_CALLABLE(callback)) {
 | 
| -    throw MakeTypeError(kCalledNonCallable, callback);
 | 
| -  }
 | 
| -
 | 
| -  var is_array = IS_ARRAY(array);
 | 
| -  var i = 0;
 | 
| -  find_initial: if (argumentsLength < 2) {
 | 
| -    for (; i < length; i++) {
 | 
| -      if (HAS_INDEX(array, i, is_array)) {
 | 
| -        current = array[i++];
 | 
| -        break find_initial;
 | 
| -      }
 | 
| -    }
 | 
| -    throw MakeTypeError(kReduceNoInitial);
 | 
| -  }
 | 
| -
 | 
| -  var stepping = DEBUG_IS_ACTIVE && %DebugCallbackSupportsStepping(callback);
 | 
| -  for (; i < length; i++) {
 | 
| -    if (HAS_INDEX(array, i, is_array)) {
 | 
| -      var element = array[i];
 | 
| -      // Prepare break slots for debugger step in.
 | 
| -      if (stepping) %DebugPrepareStepInIfStepping(callback);
 | 
| -      current = callback(current, element, i, array);
 | 
| -    }
 | 
| -  }
 | 
| -  return current;
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function ArrayReduce(callback, current) {
 | 
| -  CHECK_OBJECT_COERCIBLE(this, "Array.prototype.reduce");
 | 
| -
 | 
| -  // Pull out the length so that modifications to the length in the
 | 
| -  // loop will not affect the looping and side effects are visible.
 | 
| -  var array = TO_OBJECT(this);
 | 
| -  var length = TO_LENGTH_OR_UINT32(array.length);
 | 
| -  return InnerArrayReduce(callback, current, array, length,
 | 
| -                          %_ArgumentsLength());
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function InnerArrayReduceRight(callback, current, array, length,
 | 
| -                               argumentsLength) {
 | 
| -  if (!IS_CALLABLE(callback)) {
 | 
| -    throw MakeTypeError(kCalledNonCallable, callback);
 | 
| -  }
 | 
| -
 | 
| -  var is_array = IS_ARRAY(array);
 | 
| -  var i = length - 1;
 | 
| -  find_initial: if (argumentsLength < 2) {
 | 
| -    for (; i >= 0; i--) {
 | 
| -      if (HAS_INDEX(array, i, is_array)) {
 | 
| -        current = array[i--];
 | 
| -        break find_initial;
 | 
| -      }
 | 
| -    }
 | 
| -    throw MakeTypeError(kReduceNoInitial);
 | 
| -  }
 | 
| -
 | 
| -  var stepping = DEBUG_IS_ACTIVE && %DebugCallbackSupportsStepping(callback);
 | 
| -  for (; i >= 0; i--) {
 | 
| -    if (HAS_INDEX(array, i, is_array)) {
 | 
| -      var element = array[i];
 | 
| -      // Prepare break slots for debugger step in.
 | 
| -      if (stepping) %DebugPrepareStepInIfStepping(callback);
 | 
| -      current = callback(current, element, i, array);
 | 
| -    }
 | 
| -  }
 | 
| -  return current;
 | 
| -}
 | 
| -
 | 
| -
 | 
| -function ArrayReduceRight(callback, current) {
 | 
| -  CHECK_OBJECT_COERCIBLE(this, "Array.prototype.reduceRight");
 | 
| -
 | 
| -  // Pull out the length so that side effects are visible before the
 | 
| -  // callback function is checked.
 | 
| -  var array = TO_OBJECT(this);
 | 
| -  var length = TO_LENGTH_OR_UINT32(array.length);
 | 
| -  return InnerArrayReduceRight(callback, current, array, length,
 | 
| -                               %_ArgumentsLength());
 | 
| -}
 | 
| -
 | 
| -// ES5, 15.4.3.2
 | 
| -function ArrayIsArray(obj) {
 | 
| -  return IS_ARRAY(obj);
 | 
| -}
 | 
| -
 | 
| -
 | 
| -// -------------------------------------------------------------------
 | 
| -
 | 
| -// Set up non-enumerable constructor property on the Array.prototype
 | 
| -// object.
 | 
| -%AddNamedProperty(GlobalArray.prototype, "constructor", GlobalArray,
 | 
| -                  DONT_ENUM);
 | 
| -
 | 
| -// Set up unscopable properties on the Array.prototype object.
 | 
| -var unscopables = {
 | 
| -  __proto__: null,
 | 
| -  copyWithin: true,
 | 
| -  entries: true,
 | 
| -  fill: true,
 | 
| -  find: true,
 | 
| -  findIndex: true,
 | 
| -  keys: true,
 | 
| -};
 | 
| -
 | 
| -%AddNamedProperty(GlobalArray.prototype, unscopablesSymbol, unscopables,
 | 
| -                  DONT_ENUM | READ_ONLY);
 | 
| -
 | 
| -// Set up non-enumerable functions on the Array object.
 | 
| -utils.InstallFunctions(GlobalArray, DONT_ENUM, [
 | 
| -  "isArray", ArrayIsArray
 | 
| -]);
 | 
| -
 | 
| -var specialFunctions = %SpecialArrayFunctions();
 | 
| -
 | 
| -var getFunction = function(name, jsBuiltin, len) {
 | 
| -  var f = jsBuiltin;
 | 
| -  if (specialFunctions.hasOwnProperty(name)) {
 | 
| -    f = specialFunctions[name];
 | 
| -  }
 | 
| -  if (!IS_UNDEFINED(len)) {
 | 
| -    %FunctionSetLength(f, len);
 | 
| -  }
 | 
| -  return f;
 | 
| -};
 | 
| -
 | 
| -// Set up non-enumerable functions of the Array.prototype object and
 | 
| -// set their names.
 | 
| -// Manipulate the length of some of the functions to meet
 | 
| -// expectations set by ECMA-262 or Mozilla.
 | 
| -utils.InstallFunctions(GlobalArray.prototype, DONT_ENUM, [
 | 
| -  "toString", getFunction("toString", ArrayToString),
 | 
| -  "toLocaleString", getFunction("toLocaleString", ArrayToLocaleString),
 | 
| -  "join", getFunction("join", ArrayJoin),
 | 
| -  "pop", getFunction("pop", ArrayPop),
 | 
| -  "push", getFunction("push", ArrayPush, 1),
 | 
| -  "reverse", getFunction("reverse", ArrayReverse),
 | 
| -  "shift", getFunction("shift", ArrayShift),
 | 
| -  "unshift", getFunction("unshift", ArrayUnshift, 1),
 | 
| -  "slice", getFunction("slice", ArraySlice, 2),
 | 
| -  "splice", getFunction("splice", ArraySplice, 2),
 | 
| -  "sort", getFunction("sort", ArraySort),
 | 
| -  "filter", getFunction("filter", ArrayFilter, 1),
 | 
| -  "forEach", getFunction("forEach", ArrayForEach, 1),
 | 
| -  "some", getFunction("some", ArraySome, 1),
 | 
| -  "every", getFunction("every", ArrayEvery, 1),
 | 
| -  "map", getFunction("map", ArrayMap, 1),
 | 
| -  "indexOf", getFunction("indexOf", ArrayIndexOf, 1),
 | 
| -  "lastIndexOf", getFunction("lastIndexOf", ArrayLastIndexOf, 1),
 | 
| -  "reduce", getFunction("reduce", ArrayReduce, 1),
 | 
| -  "reduceRight", getFunction("reduceRight", ArrayReduceRight, 1)
 | 
| -]);
 | 
| -
 | 
| -%FinishArrayPrototypeSetup(GlobalArray.prototype);
 | 
| -
 | 
| -// The internal Array prototype doesn't need to be fancy, since it's never
 | 
| -// exposed to user code.
 | 
| -// Adding only the functions that are actually used.
 | 
| -utils.SetUpLockedPrototype(InternalArray, GlobalArray(), [
 | 
| -  "indexOf", getFunction("indexOf", ArrayIndexOf),
 | 
| -  "join", getFunction("join", ArrayJoin),
 | 
| -  "pop", getFunction("pop", ArrayPop),
 | 
| -  "push", getFunction("push", ArrayPush),
 | 
| -  "shift", getFunction("shift", ArrayShift),
 | 
| -  "sort", getFunction("sort", ArraySort),
 | 
| -  "splice", getFunction("splice", ArraySplice)
 | 
| -]);
 | 
| -
 | 
| -utils.SetUpLockedPrototype(InternalPackedArray, GlobalArray(), [
 | 
| -  "join", getFunction("join", ArrayJoin),
 | 
| -  "pop", getFunction("pop", ArrayPop),
 | 
| -  "push", getFunction("push", ArrayPush),
 | 
| -  "shift", getFunction("shift", ArrayShift)
 | 
| -]);
 | 
| -
 | 
| -// -------------------------------------------------------------------
 | 
| -// Exports
 | 
| -
 | 
| -utils.Export(function(to) {
 | 
| -  to.ArrayIndexOf = ArrayIndexOf;
 | 
| -  to.ArrayJoin = ArrayJoin;
 | 
| -  to.ArrayPush = ArrayPush;
 | 
| -  to.ArrayToString = ArrayToString;
 | 
| -  to.InnerArrayEvery = InnerArrayEvery;
 | 
| -  to.InnerArrayFilter = InnerArrayFilter;
 | 
| -  to.InnerArrayForEach = InnerArrayForEach;
 | 
| -  to.InnerArrayIndexOf = InnerArrayIndexOf;
 | 
| -  to.InnerArrayJoin = InnerArrayJoin;
 | 
| -  to.InnerArrayLastIndexOf = InnerArrayLastIndexOf;
 | 
| -  to.InnerArrayMap = InnerArrayMap;
 | 
| -  to.InnerArrayReduce = InnerArrayReduce;
 | 
| -  to.InnerArrayReduceRight = InnerArrayReduceRight;
 | 
| -  to.InnerArraySome = InnerArraySome;
 | 
| -  to.InnerArraySort = InnerArraySort;
 | 
| -  to.InnerArrayToLocaleString = InnerArrayToLocaleString;
 | 
| -  to.PackedArrayReverse = PackedArrayReverse;
 | 
| -});
 | 
| -
 | 
| -%InstallToContext([
 | 
| -  "array_pop", ArrayPop,
 | 
| -  "array_push", ArrayPush,
 | 
| -  "array_shift", ArrayShift,
 | 
| -  "array_splice", ArraySplice,
 | 
| -  "array_slice", ArraySlice,
 | 
| -  "array_unshift", ArrayUnshift,
 | 
| -]);
 | 
| -
 | 
| -});
 | 
| 
 |