| // 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-array.prototype.map |
| description: Species constructor is used to create a new instance |
| info: | |
| [...] |
| 5. Let A be ? ArraySpeciesCreate(O, len). |
| [...] |
| |
| 9.4.2.3 ArraySpeciesCreate |
| |
| [...] |
| 5. Let C be ? Get(originalArray, "constructor"). |
| [...] |
| 7. If Type(C) is Object, then |
| a. Let C be ? Get(C, @@species). |
| b. If C is null, let C be undefined. |
| [...] |
| 10. Return ? Construct(C, « length »). |
| features: [Symbol.species] |
| ---*/ |
| |
| var thisValue, args, result; |
| var callCount = 0; |
| var instance = []; |
| var Ctor = function() { |
| callCount += 1; |
| thisValue = this; |
| args = arguments; |
| return instance; |
| }; |
| var a = [1, 2, 3, 4, 5]; |
| a.constructor = {}; |
| a.constructor[Symbol.species] = Ctor; |
| |
| result = a.map(function() {}); |
| |
| assert.sameValue(callCount, 1, 'Constructor invoked exactly once'); |
| assert.sameValue(Object.getPrototypeOf(thisValue), Ctor.prototype); |
| assert.sameValue(args.length, 1, 'Constructor invoked with a single argument'); |
| assert.sameValue(args[0], 5); |
| assert.sameValue(result, instance); |