Strict mode Passingnon-Strict mode Passing
Features:
- ∅
// 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.concat description: Constructor is ignored for non-Array values info: | 1. Let O be ? ToObject(this value). 2. Let A be ? ArraySpeciesCreate(O, 0). 9.4.2.3 ArraySpeciesCreate [...] 3. Let isArray be ? IsArray(originalArray). 4. If isArray is false, return ? ArrayCreate(length). ---*/ var obj = { length: 0 }; var callCount = 0; var result; Object.defineProperty(obj, 'constructor', { get: function() { callCount += 1; } }); result = Array.prototype.concat.call(obj); assert.sameValue(callCount, 0, 'The value of callCount is expected to be 0'); assert.sameValue( Object.getPrototypeOf(result), Array.prototype, 'Object.getPrototypeOf(Array.prototype.concat.call(obj)) returns Array.prototype' ); assert(Array.isArray(result), 'Array.isArray(result) must return true'); assert.sameValue(result.length, 1, 'The value of result.length is expected to be 1'); assert.sameValue(result[0], obj, 'The value of result[0] is expected to equal the value of obj');