Add includes method to typed arrays

test/mjsunit/harmony/typed-array-includes.js

Index: test/mjsunit/harmony/typed-array-includes.js
diff --git a/test/mjsunit/harmony/typed-array-includes.js b/test/mjsunit/harmony/typed-array-includes.js
new file mode 100644
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+++ b/test/mjsunit/harmony/typed-array-includes.js
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+// Copyright 2015 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-array-includes
+
+// Largely ported from
+// https://github.com/tc39/Array.prototype.includes/tree/master/test/built-ins/TypedArray/prototype/includes
+// using https://www.npmjs.org/package/test262-to-mjsunit with further edits
+
+
+function testTypedArrays(callback) {
+  [
+    Uint8Array,
+    Int8Array,
+    Uint16Array,
+    Int16Array,
+    Uint32Array,
+    Int32Array,
+    Uint8ClampedArray,
+    Float32Array,
+    Float64Array
+  ]
+  .forEach(callback);
+}
+
+testTypedArrays.floatOnly = function (callback) {
+  [Float32Array, Float64Array].forEach(callback);
+};
+
+
+// %TypedArray%.prototype.includes throws a TypeError when used on non-typed
+// arrays
+(function() {
+  var taIncludes = Uint8Array.prototype.includes;
+
+  assertThrows(function() {
+    taIncludes.call({
+      length: 2,
+      0: 1,
+      1: 2
+    }, 2);
+  }, TypeError);
+
+  assertThrows(function() {
+    taIncludes.call([1, 2, 3], 2);
+  }, TypeError);
+
+  assertThrows(function() {
+    taIncludes.call(null, 2);
+  }, TypeError);
+
+  assertThrows(function() {
+    taIncludes.call(undefined, 2);
+  }, TypeError);
+})();
+
+
+// %TypedArray%.prototype.includes should terminate if ToNumber ends up being
+// called on a symbol fromIndex
+(function() {
+  testTypedArrays(function(TypedArrayConstructor) {
+    var ta = new TypedArrayConstructor([1, 2, 3]);
+
+    assertThrows(function() {
+      ta.includes(2, Symbol());
+    }, TypeError);
+  });
+})();
+
+
+// %TypedArray%.prototype.includes should terminate if an exception occurs
+// converting the fromIndex to a number
+(function() {
+  function Test262Error() {}
+
+  var fromIndex = {
+    valueOf: function() {
+      throw new Test262Error();
+    }
+  };
+
+  testTypedArrays(function(TypedArrayConstructor) {
+    var ta = new TypedArrayConstructor([1, 2, 3]);
+
+    assertThrows(function() {
+      ta.includes(2, fromIndex);
+    }, Test262Error);
+  });
+})();
+
+
+// %TypedArray%.prototype.includes should search the whole array, as the
+// optional second argument fromIndex defaults to 0
+(function() {
+  testTypedArrays(function(TypedArrayConstructor) {
+    var ta = new TypedArrayConstructor([1, 2, 3]);
+    assertTrue(ta.includes(1));
+    assertTrue(ta.includes(2));
+    assertTrue(ta.includes(3));
+  });
+})();
+
+
+// %TypedArray%.prototype.includes returns false if fromIndex is greater or
+// equal to the length of the array
+(function() {
+  testTypedArrays(function(TypedArrayConstructor) {
+    var ta = new TypedArrayConstructor([1, 2]);
+    assertFalse(ta.includes(2, 3));
+    assertFalse(ta.includes(2, 2));
+  });
+})();
+
+
+// %TypedArray%.prototype.includes searches the whole array if the computed
+// index from the given negative fromIndex argument is less than 0
+(function() {
+  testTypedArrays(function(TypedArrayConstructor) {
+    var ta = new TypedArrayConstructor([1, 3]);
+    assertTrue(ta.includes(1, -4));
+    assertTrue(ta.includes(1, -4));
+  });
+})();
+
+
+// %TypedArray%.prototype.includes should use a negative value as the offset
+// from the end of the array to compute fromIndex
+(function() {
+  testTypedArrays(function(TypedArrayConstructor) {
+    var ta = new TypedArrayConstructor([12, 13]);
+    assertTrue(ta.includes(13, -1));
+    assertFalse(ta.includes(12, -1));
+    assertTrue(ta.includes(12, -2));
+  });
+})();
+
+
+// %TypedArray%.prototype.includes converts its fromIndex parameter to an
+// integer
+(function() {
+  testTypedArrays(function(TypedArrayConstructor) {
+    var ta = new TypedArrayConstructor([1, 2, 3]);
+    assertFalse(ta.includes(1, 3.3));
+    assertTrue(ta.includes(1, -Infinity));
+    assertTrue(ta.includes(3, 2.9));
+    assertTrue(ta.includes(3, NaN));
+
+    var numberLike = {
+      valueOf: function() {
+        return 2;
+      }
+    };
+
+    assertFalse(ta.includes(1, numberLike));
+    assertFalse(ta.includes(1, "2"));
+    assertTrue(ta.includes(3, numberLike));
+    assertTrue(ta.includes(3, "2"));
+  });
+})();
+
+
+// %TypedArray%.prototype.includes should have length 1
+(function() {
+  assertEquals(1, Uint8Array.prototype.includes.length);
+})();
+
+
+// %TypedArray%.prototype.includes should have name property with value
+// 'includes'
+(function() {
+  assertEquals("includes", Uint8Array.prototype.includes.name);
+})();
+
+
+// %TypedArray%.prototype.includes should always return false on zero-length
+// typed arrays
+(function() {
+  testTypedArrays(function(TypedArrayConstructor) {
+    var ta = new TypedArrayConstructor([]);
+    assertFalse(ta.includes(2));
+    assertFalse(ta.includes());
+    assertFalse(ta.includes(undefined));
+    assertFalse(ta.includes(NaN));
+  });
+})();
+
+
+// %TypedArray%.prototype.includes should use the SameValueZero algorithm to
+// compare
+(function() {
+  testTypedArrays.floatOnly(function(FloatArrayConstructor) {
+    assertTrue(new FloatArrayConstructor([1, 2, NaN]).includes(NaN));
+    assertTrue(new FloatArrayConstructor([1, 2, -0]).includes(+0));
+    assertTrue(new FloatArrayConstructor([1, 2, -0]).includes(-0));
+    assertTrue(new FloatArrayConstructor([1, 2, +0]).includes(-0));
+    assertTrue(new FloatArrayConstructor([1, 2, +0]).includes(+0));
+    assertFalse(new FloatArrayConstructor([1, 2, -Infinity]).includes(+Infinity));
+    assertTrue(new FloatArrayConstructor([1, 2, -Infinity]).includes(-Infinity));
+    assertFalse(new FloatArrayConstructor([1, 2, +Infinity]).includes(-Infinity));
+    assertTrue(new FloatArrayConstructor([1, 2, +Infinity]).includes(+Infinity));
+  });
+})();