Advantages of Map

Map object provided by ES6. A key of a Map may occur once, which will be unique in the map’s collection. There are slight advantages to using a map rather than an object.

• Accidental Keys & Security: No default keys are stored, only contain what’s explicitly put into them. Because of that, it’s safe to use.
• Key Types & Order: It can be any value as a key function, object anything. And the order is straightforward way in the order of entry insertion.
• Size: Because of the size property a map can be easily retrieved.
• Performance: Any operation can be performed on math so easily in a better way.
• Serialization and parsing: We can create our own serialization and parsing support for Map by using JSON.stringify() and JSON.parse() methods.

map() creates a new array from calling a function for every array element. It does not execute the function for empty elements or change the original array. JavaScript Map is a collection of key-value pairs, enabling efficient data retrieval and manipulation.

On iterating a map object returns the key, and value pair in the same order as inserted. Map() constructor is used to create Map in JavaScript.

JavaScript Map has a property that represents the size of the map.

Example:

Input:
let map1 = new Map([
    [1 , 10], [2 , 20] ,
    [3, 30],[4, 40]
    ]);
     
console.log("Map1: ");
console.log(map1);
Output:
// Map1: 
// Map(4) { 1 => 10, 2 => 20, 3 => 30, 4 => 40 }

Steps to Create a Map

• Passing an Array to new Map()
• Create a Map and use Map.set()