How to Implement Sets in JavaScript: Objects, ES6 Set, or Pre-Built Libraries?

Mimicking Sets in JavaScript?

In JavaScript, managing unique and unordered string values can be achieved by utilizing a custom implementation of a set. While JavaScript lacks a native set object, we can create a surrogate using a combination of objects and functions.

Using an Object

One common approach is to employ an object as a set. By assigning unique keys representing elements and setting their values to any constant (e.g., true), you can establish an object-based set.

Initialization:

<code class="javascript">var myObject = {};</code>

Adding Elements:

<code class="javascript">myObject[element] = true;</code>

Checking for Element Existence:

<code class="javascript">element in myObject</code>

Removing Elements:

<code class="javascript">delete myObject[element];</code>

ES6 Set Object

In modern environments compatible with ES6, the built-in Set object provides a more elegant solution for handling sets.

Initialization:

<code class="javascript">var mySet = new Set();</code>

Adding Elements:

<code class="javascript">mySet.add(element);</code>

Checking for Element Existence:

<code class="javascript">mySet.has(element);</code>

Removing Elements:

<code class="javascript">mySet.delete(element);</code>

Pre-Built Sets

For non-ES6 environments, various pre-built set objects are available, such as the miniSet or the set object provided by the prebuilt extended collections. These custom sets offer a convenient and feature-rich alternative to the object-based approach.

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