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.

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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.

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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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