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// Copyright (C) 2015 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es6id: 13.6.4.13
description: >
Iterators should be closed via their `return` method when iteration is
interrupted via a `throw` statement.
features: [Symbol.iterator]
---*/
var startedCount = 0;
var returnCount = 0;
var iterationCount = 0;
var iterable = {};
iterable[Symbol.iterator] = function() {
return {
next: function() {
startedCount += 1;
return { done: false, value: null };
},
return: function() {
returnCount += 1;
return {};
}
};
};
try {
for (var x of iterable) {
assert.sameValue(
startedCount, 1, 'Value is retrieved'
);
assert.sameValue(
returnCount, 0, 'Iterator is not closed'
);
iterationCount += 1;
throw 0;
}
} catch (err) {}
assert.sameValue(
startedCount, 1, 'Iterator does not restart following interruption'
);
assert.sameValue(iterationCount, 1, 'A single iteration occurs');
assert.sameValue(
returnCount, 1, 'Iterator is closed after `throw` statement'
);
reportCompare(0, 0);
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