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Deprecated
This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Do not use it in old or new projects. Pages or Web apps using it may break at any time.
Non-standard. The
StopIteration object is a SpiderMonkey-specific feature. For future-facing usages, consider using for..of loops and the iterator protocol.The StopIteration object is used to tell the end of the iteration in the legacy iterator protocol.
Syntax
StopIteration
Description
StopIteration is a part of legacy iterator protocol, and it will be removed at the same time as legacy iterator and legacy generator.
Examples
StopIteration is thrown by Iterator.
var a = {
x: 10,
y: 20,
};
var iter = Iterator(a);
console.log(iter.next()); // ["x", 10]
console.log(iter.next()); // ["y", 20]
console.log(iter.next()); // throws StopIteration
Throwing StopIteration.
function f() {
yield 1;
yield 2;
throw StopIteration;
yield 3; // this is not executed.
}
for (var n in f()) {
console.log(n); // 1
// 2
}
Specifications
Non-standard. Not part of any current standards document.
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | No support | (Yes) | No support | No support | No support |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | No support | No support | (Yes) | No support | No support | No support |