The set()
method adds a new element with a specified key and value to a WeakMap
object.
WeakMap.prototype.set()
Try it
Syntax
set(key, value)
Parameters
-
key
-
Required. Must be
object
. The key of the element to add to theWeakMap
object. -
value
-
Required. Any value. The value of the element to add to the
WeakMap
object.
Return value
The WeakMap
object.
Examples
Using the set() method
var wm = new WeakMap(); var obj = {}; // Add new elements to the WeakMap wm.set(obj, 'foo').set(window, 'bar'); // chainable // Update an element in the WeakMap wm.set(obj, '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 |
36
|
12
|
6
Before Firefox 38, this method threw a
TypeError when the key parameter was not an object. This has been fixed in version 38 and later to return
false as per the ES2015 standard.
|
11
Returns 'undefined' instead of the 'Map' object.
|
23
|
8
|
37
|
36
|
6
Before Firefox 38, this method threw a
TypeError when the key parameter was not an object. This has been fixed in version 38 and later to return
false as per the ES2015 standard.
|
24
|
8
|
3.0
|
1.0
|
0.12.0
0.10.0
|
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/WeakMap/set