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    Map.prototype.set()

    The set() method adds or updates an element with a specified key and value to a Map object.

    Syntax

    myMap.set(key, value);

    Parameters

    key
    Required. The key of the element to add to the Map object.
    value
    Required. The value of the element to add to the Map object.

    Return value

    The Map object.

    Examples

    Using the set method

    var myMap = new Map();

// Add new elements to the map
myMap.set("bar", "foo");
myMap.set(1, "foobar");

// Update an element in the map
myMap.set("bar", "baz");

    Specifications

    Specification Status Comment
    ECMAScript 2015 (6th Edition, ECMA-262)
    The definition of 'Map.prototype.set' in that specification.    		 Standard Initial definition.
    ECMAScript 2017 Draft (ECMA-262)
    The definition of 'Map.prototype.set' in that specification.    		 Draft  

    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 No support 38 13.0 (13.0) No support No support 8

    Compatibility notes

    • Prior to Firefox 33 (Firefox 33 / Thunderbird 33 / SeaMonkey 2.30), Map.prototype.set 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

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     Contributors to this page: grantcarthew, SphinxKnight, zachary05, fscholz, realityking
     Last updated by: grantcarthew,