WeakMap.prototype.set()
The set()
method adds a new element with a specified key
and value
to a WeakMap
object.
Syntax
JavaScript
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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
JavaScript
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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 2017 Draft (ECMA-262) The definition of 'WeakMap.prototype.set' in that specification. |
Draft |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | 36 | 6.0 (6.0) | 11 | 23 | 7.1 |
Feature | Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|
Basic support | No support | 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).
See also
License
© 2016 Mozilla Contributors
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