The set() method adds or updates an element with a specified key and a value to a Map object.
Map.prototype.set()
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Syntax
set(key, value)
Parameters
-
key -
The key of the element to add to the
Mapobject. The key may be any JavaScript type (any primitive value or any type of JavaScript object). -
value -
The value of the element to add to the
Mapobject. The value may be any JavaScript type (any primitive value or any type of JavaScript 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
Browser compatibility
| Desktop | Mobile | Server | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | Deno | Node.js | |
set |
38
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12
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13
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11
Returns 'undefined' instead of the 'Map' object.
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25
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8
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38
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38
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14
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25
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8
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3.0
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1.0
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0.12.0
0.10.0
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See also
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/set
