1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-generator-function-definitions-runtime-semantics-evaluation
es6id: 14.4.14
description: Value received from invocation of generator's `next` method
info: |
YieldExpression : yield * AssignmentExpression
1. Let exprRef be the result of evaluating AssignmentExpression.
2. Let value be ? GetValue(exprRef).
3. Let iterator be ? GetIterator(value).
4. Let received be NormalCompletion(undefined).
5. Repeat
a. If received.[[Type]] is normal, then
i. Let innerResult be ? IteratorNext(iterator, received.[[Value]]).
ii. Let done be ? IteratorComplete(innerResult).
iii. If done is true, then
1. Return ? IteratorValue(innerResult).
7.4.4 IteratorValue
1. Assert: Type(iterResult) is Object.
2. Return ? Get(iterResult, "value").
features: [generators, Symbol.iterator]
---*/
var quickIter = {};
var exprValue, nextReceived, done, iter;
quickIter[Symbol.iterator] = function() {
return {
next: function(x) {
nextReceived = x;
return {
done: done,
value: 3333
};
}
};
};
function* g() {
exprValue = yield * quickIter;
}
done = true;
iter = g();
iter.next(4444);
assert.sameValue(
nextReceived, undefined, 'received value (previously-exhausted iterator)'
);
assert.sameValue(exprValue, 3333, 'expression value (previously-exhausted iterator)');
done = false;
exprValue = null;
iter = g();
iter.next(2222);
done = true;
iter.next(5555);
assert.sameValue(nextReceived, 5555, 'received value');
assert.sameValue(exprValue, 3333, 'expression value');
reportCompare(0, 0);
|
