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');
Using the set
method with chaining
Since the set()
method returns back the same Map
object, you can chain the method call like below:
// Add new elements to the map with chaining. myMap.set('bar', 'foo') .set(1, 'foobar') .set(2, 'baz');
Specifications
Specification | Status | Comment |
---|---|---|
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Map.prototype.set' in that specification. |
Standard | Initial definition. |
ECMAScript Latest Draft (ECMA-262) The definition of 'Map.prototype.set' in that specification. |
Living Standard |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic support | 38 | 12 | 13 | 111 | 25 | 8 |
Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
---|---|---|---|---|---|---|---|
Basic support | 38 | 38 | 12 | 14 | 11 | 25 | 8 |
1. Returns 'undefined' instead of the 'Map' object.
See also
Document Tags and Contributors
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Contributors to this page:
ecgan,
fscholz,
jameshkramer,
nmve,
kdex,
cormickjbrowne,
grantcarthew,
SphinxKnight,
zachary05,
realityking
Last updated by:
ecgan,