mirror of https://github.com/tc39/test262.git
63 lines
1.7 KiB
JavaScript
63 lines
1.7 KiB
JavaScript
// Copyright (C) 2016 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-generator-function-definitions-runtime-semantics-evaluation
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es6id: 14.4.14
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description: Value received from invocation of generator's `next` method
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info: |
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YieldExpression : yield * AssignmentExpression
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1. Let exprRef be the result of evaluating AssignmentExpression.
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2. Let value be ? GetValue(exprRef).
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3. Let iterator be ? GetIterator(value).
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4. Let received be NormalCompletion(undefined).
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5. Repeat
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a. If received.[[Type]] is normal, then
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i. Let innerResult be ? IteratorNext(iterator, received.[[Value]]).
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ii. Let done be ? IteratorComplete(innerResult).
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iii. If done is true, then
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1. Return ? IteratorValue(innerResult).
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7.4.4 IteratorValue
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1. Assert: Type(iterResult) is Object.
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2. Return ? Get(iterResult, "value").
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features: [generators, Symbol.iterator]
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---*/
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var quickIter = {};
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var exprValue, nextReceived, done, iter;
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quickIter[Symbol.iterator] = function() {
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return {
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next: function(x) {
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nextReceived = x;
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return {
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done: done,
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value: 3333
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};
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}
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};
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};
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function* g() {
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exprValue = yield * quickIter;
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}
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done = true;
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iter = g();
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iter.next(4444);
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assert.sameValue(
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nextReceived, undefined, 'received value (previously-exhausted iterator)'
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);
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assert.sameValue(exprValue, 3333, 'expression value (previously-exhausted iterator)');
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done = false;
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exprValue = null;
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iter = g();
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iter.next(2222);
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done = true;
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iter.next(5555);
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assert.sameValue(nextReceived, 5555, 'received value');
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assert.sameValue(exprValue, 3333, 'expression value');
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