| // Copyright (C) 2016 the V8 project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| /*--- |
| esid: sec-%typedarray%.prototype.filter |
| description: > |
| Use custom @@species constructor if available |
| info: | |
| 22.2.3.9 %TypedArray%.prototype.filter ( callbackfn [ , thisArg ] ) |
| |
| ... |
| 10. Let A be ? TypedArraySpeciesCreate(O, « captured »). |
| ... |
| |
| 22.2.4.7 TypedArraySpeciesCreate ( exemplar, argumentList ) |
| |
| ... |
| 3. Let constructor be ? SpeciesConstructor(exemplar, defaultConstructor). |
| 4. Return ? TypedArrayCreate(constructor, argumentList). |
| |
| 7.3.20 SpeciesConstructor ( O, defaultConstructor ) |
| |
| ... |
| 5. Let S be ? Get(C, @@species). |
| ... |
| 7. If IsConstructor(S) is true, return S. |
| ... |
| |
| 22.2.4.6 TypedArrayCreate ( constructor, argumentList ) |
| |
| 1. Let newTypedArray be ? Construct(constructor, argumentList). |
| 2. Perform ? ValidateTypedArray(newTypedArray). |
| 3. If argumentList is a List of a single Number, then |
| ... |
| 4. Return newTypedArray. |
| includes: [testTypedArray.js, compareArray.js] |
| features: [Symbol.species, TypedArray] |
| ---*/ |
| |
| testWithTypedArrayConstructors(function(TA) { |
| var sample = new TA([40, 41, 42]); |
| var calls = 0; |
| var other, result; |
| |
| sample.constructor = {}; |
| sample.constructor[Symbol.species] = function(captured) { |
| calls++; |
| other = new TA(captured); |
| return other; |
| }; |
| |
| result = sample.filter(function() { return true; }); |
| |
| assert.sameValue(calls, 1, "ctor called once"); |
| assert.sameValue(result, other, "return is instance of custom constructor"); |
| assert(compareArray(result, [40, 41, 42]), "values are set on the new obj"); |
| }); |