The Symbol.keyFor(sym)
method retrieves a shared symbol key from the global symbol registry for the given symbol.
Symbol.keyFor()
Try it
Syntax
Symbol.keyFor(sym);
Parameters
-
sym
-
Symbol, required. The symbol to find a key for.
Return value
A string representing the key for the given symbol if one is found on the global registry; otherwise, undefined
.
Examples
Using keyFor()
var globalSym = Symbol.for('foo'); // create a new global symbol Symbol.keyFor(globalSym); // "foo" var localSym = Symbol(); Symbol.keyFor(localSym); // undefined // well-known symbols are not symbols registered // in the global symbol registry Symbol.keyFor(Symbol.iterator) // undefined
Specifications
Specification |
---|
ECMAScript Language Specification # sec-symbol.keyfor |
Browser compatibility
Desktop | Mobile | Server | ||||||||||||
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Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | Deno | Node.js | |
keyFor |
40
|
12
|
36
|
No
|
27
|
9
|
40
|
40
|
36
|
27
|
9
|
4.0
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1.0
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0.12.0
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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/Symbol/keyFor