| // 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.slice |
| description: > |
| Use custom @@species constructor if available |
| info: | |
| 22.2.3.24 %TypedArray%.prototype.slice ( start, end ) |
| |
| ... |
| 9. Let A be ? TypedArraySpeciesCreate(O, « count »). |
| ... |
| |
| 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 result; |
| |
| sample.constructor = {}; |
| sample.constructor[Symbol.species] = function(count) { |
| calls++; |
| return new TA(count); |
| }; |
| |
| result = sample.slice(1); |
| |
| assert.sameValue(calls, 1, "ctor called once"); |
| assert(compareArray(result, [41, 42]), "expected object"); |
| }); |