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67 lines
2.0 KiB
JavaScript
67 lines
2.0 KiB
JavaScript
// Copyright 2015 Microsoft Corporation. All rights reserved.
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// This code is governed by the license found in the LICENSE file.
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/*---
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esid: sec-array.from
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description: Map function without thisArg on non strict mode
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info: |
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22.1.2.1 Array.from ( items [ , mapfn [ , thisArg ] ] )
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...
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10. Let len be ToLength(Get(arrayLike, "length")).
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11. ReturnIfAbrupt(len).
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12. If IsConstructor(C) is true, then
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a. Let A be Construct(C, «len»).
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13. Else,
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b. Let A be ArrayCreate(len).
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14. ReturnIfAbrupt(A).
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15. Let k be 0.
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16. Repeat, while k < len
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a. Let Pk be ToString(k).
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b. Let kValue be Get(arrayLike, Pk).
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c. ReturnIfAbrupt(kValue).
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d. If mapping is true, then
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i. Let mappedValue be Call(mapfn, T, «kValue, k»).
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...
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flags: [noStrict]
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---*/
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var list = {
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'0': 41,
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'1': 42,
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'2': 43,
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length: 3
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};
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var calls = [];
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function mapFn(value) {
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calls.push({
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args: arguments,
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thisArg: this
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});
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return value * 2;
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}
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var result = Array.from(list, mapFn);
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assert.sameValue(result.length, 3, 'result.length');
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assert.sameValue(result[0], 82, 'result[0]');
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assert.sameValue(result[1], 84, 'result[1]');
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assert.sameValue(result[2], 86, 'result[2]');
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assert.sameValue(calls.length, 3, 'calls.length');
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assert.sameValue(calls[0].args.length, 2, 'calls[0].args.length');
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assert.sameValue(calls[0].args[0], 41, 'calls[0].args[0]');
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assert.sameValue(calls[0].args[1], 0, 'calls[0].args[1]');
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assert.sameValue(calls[0].thisArg, this, 'calls[0].thisArg');
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assert.sameValue(calls[1].args.length, 2, 'calls[1].args.length');
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assert.sameValue(calls[1].args[0], 42, 'calls[1].args[0]');
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assert.sameValue(calls[1].args[1], 1, 'calls[1].args[1]');
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assert.sameValue(calls[1].thisArg, this, 'calls[1].thisArg');
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assert.sameValue(calls[2].args.length, 2, 'calls[2].args.length');
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assert.sameValue(calls[2].args[0], 43, 'calls[2].args[0]');
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assert.sameValue(calls[2].args[1], 2, 'calls[2].args[1]');
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assert.sameValue(calls[2].thisArg, this, 'calls[2].thisArg');
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