The set()
method adds or updates an element with a specified key and a value to a Map
object.
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Syntax
myMap.set(key, value)
Parameters
key
- The key of the element to add to the
Map
object. value
- The value of the element to add to the
Map
object.
Return value
The Map
object.
Examples
Using set()
let 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()
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 |
---|
ECMAScript (ECMA-262) The definition of 'Map.prototype.set' in that specification. |
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.
Desktop | Mobile | Server | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
set | Chrome Full support 38 | Edge Full support 12 | Firefox Full support 13 | IE
Partial support
11
| Opera Full support 25 | Safari Full support 8 | WebView Android Full support 38 | Chrome Android Full support 38 | Firefox Android Full support 14 | Opera Android Full support 25 | Safari iOS Full support 8 | Samsung Internet Android Full support 3.0 | nodejs
Full support
0.12
|
Legend
- Full support
- Full support
- Partial support
- Partial support
- See implementation notes.
- See implementation notes.
- User must explicitly enable this feature.
- User must explicitly enable this feature.