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48 lines
1.2 KiB
JavaScript
48 lines
1.2 KiB
JavaScript
// Copyright (C) 2015 the V8 project authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-array.from
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es6id: 22.1.2.1
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description: Creating object with custom constructor (traversed via iterator)
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info: >
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[...]
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6. If usingIterator is not undefined, then
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a. If IsConstructor(C) is true, then
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i. Let A be Construct(C).
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b. Else,
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i. Let A be ArrayCreate(0).
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c. ReturnIfAbrupt(A).
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features: [Symbol.iterator]
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---*/
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var thisVal, args;
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var callCount = 0;
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var C = function() {
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thisVal = this;
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args = arguments;
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callCount += 1;
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};
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var result;
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var items = {};
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items[Symbol.iterator] = function() {
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return {
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next: function() {
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return { done: true };
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}
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};
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};
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result = Array.from.call(C, items);
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assert(
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result instanceof C, 'Constructed value is an instance of the constructor'
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);
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assert.sameValue(
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result.constructor,
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C,
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'Constructed value correctly defines a `constructor` property'
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);
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assert.sameValue(callCount, 1, 'Constructor invoked exactly once');
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assert.sameValue(thisVal, result, 'Constructed value is returned');
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assert.sameValue(args.length, 0, 'Constructor invoked without arguments');
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