// Copyright 2015 Microsoft Corporation. All rights reserved. // This code is governed by the license found in the LICENSE file. /*--- esid: sec-array.from description: Calling from with a valid map function with thisArg info: | 22.1.2.1 Array.from ( items [ , mapfn [ , thisArg ] ] ) ... 10. Let len be ToLength(Get(arrayLike, "length")). 11. ReturnIfAbrupt(len). 12. If IsConstructor(C) is true, then a. Let A be Construct(C, «len»). 13. Else, b. Let A be ArrayCreate(len). 14. ReturnIfAbrupt(A). 15. Let k be 0. 16. Repeat, while k < len a. Let Pk be ToString(k). b. Let kValue be Get(arrayLike, Pk). c. ReturnIfAbrupt(kValue). d. If mapping is true, then i. Let mappedValue be Call(mapfn, T, «kValue, k»). ... ---*/ var list = { '0': 41, '1': 42, '2': 43, length: 3 }; var calls = []; var thisArg = {}; function mapFn(value) { calls.push({ args: arguments, thisArg: this }); return value * 2; } var result = Array.from(list, mapFn, thisArg); assert.sameValue(result.length, 3, 'The value of result.length is expected to be 3'); assert.sameValue(result[0], 82, 'The value of result[0] is expected to be 82'); assert.sameValue(result[1], 84, 'The value of result[1] is expected to be 84'); assert.sameValue(result[2], 86, 'The value of result[2] is expected to be 86'); assert.sameValue(calls.length, 3, 'The value of calls.length is expected to be 3'); assert.sameValue(calls[0].args.length, 2, 'The value of calls[0].args.length is expected to be 2'); assert.sameValue(calls[0].args[0], 41, 'The value of calls[0].args[0] is expected to be 41'); assert.sameValue(calls[0].args[1], 0, 'The value of calls[0].args[1] is expected to be 0'); assert.sameValue(calls[0].thisArg, thisArg, 'The value of calls[0].thisArg is expected to equal the value of thisArg'); assert.sameValue(calls[1].args.length, 2, 'The value of calls[1].args.length is expected to be 2'); assert.sameValue(calls[1].args[0], 42, 'The value of calls[1].args[0] is expected to be 42'); assert.sameValue(calls[1].args[1], 1, 'The value of calls[1].args[1] is expected to be 1'); assert.sameValue(calls[1].thisArg, thisArg, 'The value of calls[1].thisArg is expected to equal the value of thisArg'); assert.sameValue(calls[2].args.length, 2, 'The value of calls[2].args.length is expected to be 2'); assert.sameValue(calls[2].args[0], 43, 'The value of calls[2].args[0] is expected to be 43'); assert.sameValue(calls[2].args[1], 2, 'The value of calls[2].args[1] is expected to be 2'); assert.sameValue(calls[2].thisArg, thisArg, 'The value of calls[2].thisArg is expected to equal the value of thisArg'); reportCompare(0, 0);