Implement .fill() on typed arrays

test/mjsunit/harmony/typedarrays-fill.js

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-arrays --allow-natives-syntax
+
+var typedArrayConstructors = [
+  Uint8Array,
+  Int8Array,
+  Uint16Array,
+  Int16Array,
+  Uint32Array,
+  Int32Array,
+  Uint8ClampedArray,
+  Float32Array,
+  Float64Array];
+
+function CheckTypedArrayIsNeutered(array) {
+  assertEquals(0, array.byteLength);
+  assertEquals(0, array.byteOffset);
+  assertEquals(0, array.length);
+}
+
+function TestTypedArrayFill(constructor) {
+  assertEquals(1, constructor.prototype.fill.length);
+
+  assertArrayEquals([], (new constructor(0)).fill(8));
+
+  assertArrayEquals([8, 8, 8, 8, 8], (new constructor(5).fill(8)));
+  assertArrayEquals([0, 8, 8, 8, 8], (new constructor(5)).fill(8, 1));
+  assertArrayEquals([0, 0, 0, 0, 0], (new constructor(5)).fill(8, 10));
+  assertArrayEquals([8, 8, 8, 8, 8], (new constructor(5)).fill(8, -5));
+  assertArrayEquals([0, 8, 8, 8, 0], (new constructor(5)).fill(8, 1, 4));
+  assertArrayEquals([0, 8, 8, 8, 0], (new constructor(5)).fill(8, 1, -1));
+  assertArrayEquals([0, 8, 8, 8, 8], (new constructor(5)).fill(8, 1, 42));
+  assertArrayEquals([0, 0, 8, 8, 8], (new constructor(5)).fill(8, -3, 42));
+  assertArrayEquals([0, 0, 8, 8, 0], (new constructor(5)).fill(8, -3, 4));
+  assertArrayEquals([0, 0, 0, 8, 0], (new constructor(5)).fill(8, -2, -1));
+  assertArrayEquals([0, 0, 0, 0, 0], (new constructor(5)).fill(8, -1, -3));
+  assertArrayEquals([8, 8, 8, 8, 0], (new constructor(5)).fill(8, undefined, 4));
+
+  // Typed arrays with float numbers are by default filled with NaN,
+  // the ones with integral numbers are filled with zeroes.
+  var D = 0;
+  if (constructor == Float32Array || constructor == Float64Array)
+    D = NaN;
+  assertArrayEquals([D, D, D, D, D], (new constructor(5).fill()));
+
+  // Using .fill() on a neutered array must not cause errors,
+  // and the array must remain neutered afterwards.
+  var a = new constructor(5);
+  %ArrayBufferNeuter(a.buffer);
+  a.fill(8);
+  CheckTypedArrayIsNeutered(a);
+
+  // Test exceptions
+  assertThrows(function () {
+    constructor.prototype.fill.call(null);
+  }, TypeError);
+  assertThrows(function () {
+    constructor.prototype.fill.call(undefined);
+  }, TypeError);
+
+  // Check superficial features of %TypedArray%.prototype.fill.
+  var desc = Object.getOwnPropertyDescriptor(constructor.prototype, "fill");
+
+  assertEquals(false, desc.configurable);
+  assertEquals(false, desc.enumerable);
+  assertEquals(false, desc.writable);
+  assertEquals(1, constructor.prototype.fill.length);
+
+  // The %TypedArray%.prototype.fill() method should not work
+  // when transplanted to objects that are not typed arrays.
+  assertThrows(function () { constructor.prototype.fill.call([1, 2, 3], 8) }, TypeError);
+  assertThrows(function () { constructor.prototype.fill.call("abc", 8) }, TypeError);
+  assertThrows(function () { constructor.prototype.fill.call({}, 8) }, TypeError);
+  assertThrows(function () { constructor.prototype.fill.call({}, 8) }, TypeError);
+  assertThrows(function () { constructor.prototype.fill.call(0, 8) }, TypeError);
+
+  // The method should be work on instances of other typed arrays.
+  for (var otherConstructor of typedArrayConstructors) {
+    a = new otherConstructor(5);
+    constructor.prototype.fill.call(a, 8);
+    assertArrayEquals([8, 8, 8, 8, 8], a);
+  }
+}
+
+
+for (var x of typedArrayConstructors) {
+  TestTypedArrayFill(x);
+}