mirror of https://github.com/tc39/test262.git
64 lines
1.9 KiB
JavaScript
64 lines
1.9 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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es6id: 22.1.2.1
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description: >
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Arguments of mapping function (traversed via iterator)
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info: >
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[...]
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2. If mapfn is undefined, let mapping be false.
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3. else
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a. If IsCallable(mapfn) is false, throw a TypeError exception.
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b. If thisArg was supplied, let T be thisArg; else let T be undefined.
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c. Let mapping be true
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[...]
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6. If usingIterator is not undefined, then
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[...]
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g. Repeat
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[...]
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vii. If mapping is true, then
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1. Let mappedValue be Call(mapfn, T, «nextValue, k»).
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2. If mappedValue is an abrupt completion, return
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IteratorClose(iterator, mappedValue).
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3. Let mappedValue be mappedValue.[[value]].
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features: [Symbol.iterator]
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---*/
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var args = [];
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var firstResult = { done: false, value: {} };
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var secondResult = { done: false, value: {} };
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var mapFn = function(value, idx) {
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args.push(arguments);
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};
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var items = {};
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var nextResult = firstResult;
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var nextNextResult = secondResult;
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items[Symbol.iterator] = function() {
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return {
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next: function() {
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var result = nextResult;
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nextResult = nextNextResult;
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nextNextResult = { done: true };
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return result;
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}
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};
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};
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Array.from(items, mapFn);
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assert.sameValue(args.length, 2, 'Iteration count');
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assert.sameValue(args[0].length, 2, 'First iteration: arguments length');
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assert.sameValue(
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args[0][0], firstResult.value, 'First iteration: first argument'
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);
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assert.sameValue(args[0][1], 0, 'First iteration: second argument');
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assert.sameValue(args[1].length, 2, 'Second iteration: arguments length');
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assert.sameValue(
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args[1][0], secondResult.value, 'Second iteration: first argument'
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);
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assert.sameValue(args[1][1], 1, 'Second iteration: second argument');
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