Source code
Revision control
Copy as Markdown
Other Tools
// 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: Invocation of iterator `throw` 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
[...]
b. Else if received.[[Type]] is throw, then
i. Let throw be ? GetMethod(iterator, "throw").
ii. If throw is not undefined, then
1. Let innerResult be ? Call(throw, iterator, « received.[[Value]]
»).
[...]
features: [generators, Symbol.iterator]
---*/
var args, thisValue;
var callCount = 0;
var spyIterator = {
next: function() {
return { done: false };
},
throw: function() {
callCount += 1;
args = arguments;
thisValue = this;
return { done: true };
}
};
var spyIterable = {};
spyIterable[Symbol.iterator] = function() {
return spyIterator;
};
function* g() {
yield * spyIterable;
}
var iter = g();
iter.next(8888);
iter.throw(7777);
assert.sameValue(callCount, 1);
assert.sameValue(args.length, 1);
assert.sameValue(args[0], 7777);
assert.sameValue(thisValue, spyIterator);
reportCompare(0, 0);