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    Iterator

    Non-standard. The Iterator function is a SpiderMonkey-specific feature, and will be removed at some point. For future-facing usages, consider using for..of loops and the iterator protocol.

    The Iterator function returns an object which implements legacy iterator protocol and iterates over enumerable properties of an object.

    Syntax

    Iterator(object)

    Parameters

    object
    Object to iterate over properties.

    Description

    An overview of the usage is available on the Iterators and Generators page.

    Methods

    Iterator.prototype.next
    Returns next item in the [property_name, property_value] format. It throws StopIteration if there are no more items.

    Examples

    Iterating over properties of an object

    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
    

    Iterating over properties of an object with legacy destructuring for-in statement

    var a = {
      x: 10,
      y: 20,
    };
    
    for (var [name, value] in Iterator(a)) {
      console.log(name, value);   // x 10
                                  // y 20
    }
    

    Specifications

    Non-standard. Not part of any current standards document.

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support Not supported (Yes) Not supported Not supported Not supported
    Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support Not supported Not supported (Yes) Not supported Not supported Not supported

    See also

    Document Tags and Contributors

    Last updated by: fscholz,
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