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    Set.prototype.add()

    This is a new technology, part of the ECMAScript 2015 (ES6) standard .
    This technology's specification has been finalized, but check the compatibility table for usage and implementation status in various browsers.

    Summary

    The add() method appends a new element with a specified value to the end of a Set object.

    Syntax

    mySet.add(value);

    Parameters

    value
    Required. The value of the element to add to the Set object.

    Return value

    The Set object.

    Examples

    Example: Using the add method

    var mySet = new Set();
    
    mySet.add(1);
    mySet.add(5).add("some text"); // chainable
    
    console.log(mySet);
    // Set [1, 5, "some text"]
    

    Specifications

    Specification Status Comment
    ECMAScript 2015 (6th Edition, ECMA-262)
    The definition of 'Set.prototype.add' in that specification.
    Standard Initial definition.

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support 38 13.0 (13.0) 11 25 7.1
    Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support Not supported 38 13.0 (13.0) Not supported Not supported iOS 8

    Firefox-specific notes

    • Prior to Firefox 33 (Firefox 33 / Thunderbird 33 / SeaMonkey 2.30), Set.prototype.add returned undefined and was not chainable. This has been fixed (bug 1031632). The behavior can be found in Chrome/v8 as well (issue).

    See also

    Document Tags and Contributors

    Contributors to this page: fscholz, ziyunfei, realityking
    Last updated by: realityking,