WeakMap.prototype.set()
The set() method of WeakMap instances adds a new element with a specified key
and value to this WeakMap.
Try it
Syntax
js
set(key, value)
Parameters
key-
Must be either an object or a non-registered symbol. The key of the entry to add to the
WeakMapobject. value-
Any value representing the value of the entry to add to the
WeakMapobject.
Return value
The WeakMap object.
Exceptions
TypeError-
Thrown if
keyis not an object or a non-registered symbol.
Examples
Using the set() method
js
const wm = new WeakMap();
const 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");
// Using a non-registered symbol as key
const sym = Symbol("foo");
wm.set(sym, "baz");
wm.set(Symbol.iterator, "qux");
Specifications
| Specification |
|---|
| ECMAScript Language Specification # sec-weakmap.prototype.set |
Browser compatibility
| desktop | mobile | server | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
set | |||||||||||||