How to use the Map() Object in Vanilla JavaScript

Learn how to use the Map() object in vanilla JavaScript. The Map() object is to plain objects ({}) what Set() is to arrays. A Map() object is an iterable of key/value pairs that are stored and looped through in order. You can create a Map() object with the new Map() constructor. Pass in an iterable of key value pairs (also as an iterable such as an array) as an argument.

Today, we’re going to look at the Map() object.Let’s dig in.

What is the Map() object

The Map() object is to plain objects ({}) what Set() is to arrays.

A Map() object is an iterable of key/value pairs that are stored and looped through in order. The big difference between a Map() and a plain object is that Map() items retain their order, while plain object values do not.

You can create a Map() object with the new Map() constructor. Pass in an iterable of key value pairs (also as an iterable such as an array) as an argument.

// returns Map(2) {"name" => "Radagast", "color" => "brown"}
let radagast = new Map([
    ['name', 'Radagast'],
    ['color', 'brown']
]);

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JavaScript values are allocated when things are created (objects, Strings, etc.) and freed automatically when they are no longer used. This process is called Garbage collection.