The set()
method adds a new element with a specified key
and value
to a WeakMap
object.
Syntax
wm.set(key, value);
Parameters
- key
- Required. The key of the element to add to the
WeakMap
object. - value
- Required. 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
Specification | Status | Comment |
---|---|---|
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'WeakMap.prototype.set' in that specification. |
Standard | Initial definition. |
ECMAScript Latest Draft (ECMA-262) The definition of 'WeakMap.prototype.set' in that specification. |
Draft |
Browser compatibility
Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic support | 36 | (Yes) | 6.0 (6.0) | 11 | 23 | 7.1 |
Feature | Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | No support | (Yes) | 6.0 (6.0) | No support | No support | 8 |
Firefox-specific notes
- Prior to Firefox 33 (Firefox 33 / Thunderbird 33 / SeaMonkey 2.30),
WeakMap.prototype.set
returnedundefined
and was not chainable. This has been fixed (bug 1031632). The behavior can be found in Chrome/v8 as well (issue).