Symbol.keyFor()
The Symbol.keyFor(sym) method retrieves a shared symbol
key from the global symbol registry for the given symbol.
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 |
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