| // 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.subarray |
| description: > |
| Use defaultConstructor if @@species is either undefined or null |
| info: | |
| 22.2.3.27 %TypedArray%.prototype.subarray( begin , end ) |
| |
| ... |
| 17. Return ? TypedArraySpeciesCreate(O, argumentsList). |
| |
| 22.2.4.7 TypedArraySpeciesCreate ( exemplar, argumentList ) |
| |
| ... |
| 3. Let constructor be ? SpeciesConstructor(exemplar, defaultConstructor). |
| ... |
| |
| 7.3.20 SpeciesConstructor ( O, defaultConstructor ) |
| |
| ... |
| 5. Let S be ? Get(C, @@species). |
| 6. If S is either undefined or null, return defaultConstructor. |
| ... |
| includes: [testTypedArray.js] |
| features: [Symbol.species, TypedArray] |
| ---*/ |
| |
| testWithTypedArrayConstructors(function(TA) { |
| var sample = new TA(2); |
| var result; |
| |
| sample.constructor = {}; |
| |
| result = sample.subarray(0); |
| |
| assert.sameValue( |
| Object.getPrototypeOf(result), |
| Object.getPrototypeOf(sample), |
| "undefined @@species - prototype check " |
| ); |
| assert.sameValue(result.constructor, TA, "undefined @@species - ctor check"); |
| |
| sample.constructor[Symbol.species] = null; |
| result = sample.subarray(0); |
| |
| assert.sameValue( |
| Object.getPrototypeOf(result), |
| Object.getPrototypeOf(sample), |
| "null @@species - prototype check " |
| ); |
| assert.sameValue(result.constructor, TA, "null @@species - ctor check"); |
| }); |