Rediscovering JavaScript: ES6, ES7 & ES8/

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Global Registry With Symbol

Global Registry With Symbol

Learn how to create or fetch keys for Symbols in the global registry.

We'll cover the following...

Uniqueness of Symbols

When we create a Symbol using the Symbol() function, the argument passed to it has no significance, and each call to Symbol() creates a unique Symbol.

Proof by example

Let’s quickly verify this behavior with an example.

Javascript (babel-node)
'use strict';
//START:CODE
const name = 'Tom';
const tom = Symbol(name);
const jerry = Symbol('Jerry');
const anotherTom = Symbol(name);
console.log(tom);
console.log(typeof(tom));
console.log(tom === jerry);
console.log(tom === anotherTom);
//END:CODE

Explanation

  • We created three Symbols. Two of them were created using the same argument name.
  • However, since the arguments passed to the function have no significance and the Symbol
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