JavaScript Symbol for() Method

by Online Tutorials Library July 22, 2022

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

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>  

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Output:

true

Example 2

  <script>  //JavaScript to illustrate Symbol.key  // read from the registry  var TutorAspire = 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(TutorAspire === Java); // true  //expected output: true  </script>  

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Output:

true

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