JavaScript Symbol for() Method

JavaScript Symbol for() 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.for() Method

The JavaScript Symbol.for() method is used to search for existing symbol in a runtime-wide symbol registry with the provided key and returns if it found. Otherwise, a new symbol gets created with this key.

Syntax

Symbol.for(key);

Parameters

Key: The Keys to the symbol.

Return value

Existing symbol with the given key if found otherwise, a new symbol is created and returned.

Browser Support

Chrome	40
Safari	9
Firefox	36
Opera	Yes

Example 1

<script>
//JavaScript to illustrate Symbol.for
// read from the registry
// if the symbol did not exist, it is created
var i = Symbol.for("i");
var o = Symbol.for("i");
 document.write(i==o); 
//expected output: true	
</script>

Test it Now

Output:

true

Example 2

<script>
//JavaScript to illustrate Symbol.key
// read from the registry
var JavaTpoint = Symbol.for('hello'); // If the Symbol does not exist, it's created
var Java = Symbol.for('hello'); // The Symbol exists, so it is returned
document.write(JavaTpoint === Java); // true
//expected output: true
</script>

Test it Now

Output:

true

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