JavaScript Symbol keyFor() Method

JavaScript Symbol keyFor() Method with examples on javascript symbol methods, javascript symbol property, javascript tutorial, hasInstance, isConcatSpreadable, match, prototype, search, for(), keyFor(), toString(), unscopables, toPrimitive, split etc.

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JavaScript Symbol.keyFor() Method

The JavaScript Symbol.keyFor() method uses the global symbol registry to look up the key for the symbol. So it doesn't work for non-global symbols. If the symbol is not global, it won't be able to find it and return undefined.

Syntax

Symbol.keyFor(Symbol);

Parameters

Symbol(required): The symbol to find a key.

Return value

A string representing the key for the given symbol if one is found on the global registry

Browser Support

Chrome	40
Safari	9
Firefox	36
Opera	Yes

Example 1

<script>
//JavaScript to illustrate Symbol.keyFor
var i = Symbol.for("JavaTpoint");
var j = Symbol.for("Java");
document.write(Symbol.keyFor(i));
document.write("<br>");
document.write(Symbol.keyFor(j)); 
//expected output: JavaTpoint 
//Java
</script>

Test it Now

Output:

JavaTpoint
Java

Example 2

<script>
//JavaScript to illustrate Symbol.keyFor
var JavaTpoint = Symbol.for('Done');
var Java   = Symbol.for('Done');
document.write(JavaTpoint === Java);
document.write("<br>");
document.write(Symbol.keyFor(JavaTpoint));
//expected output: true
//Done
</script>

Test it Now

Output:

true
Done

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