javascript Map object vs Set object

Question

JavaScript Map and Set objects are both iterable objects. Both store object by [key, value] pair. I want to know when to use what? Is there any preference one over

Answer 1

var obj = {};
obj.name= "Anand Deep Singh";
console.log(obj.name); //logs "Anand Deep Singh"

similarly in ES6, we can use regular object.

var map = new Map();
map.set("name","Anand Deep Singh");
console.log(map.get("name")); //logs "Anand Deep Singh"

But noticeable thing is a Map isn’t created with the literal object syntax, and that one uses set and get methods to store and access data.

It has a has method to check whether the key exists in the object or not, delete method to delete the object and clear method to clear the entire object.

Set is a unique list of values. It’s simply a unique list.

var set = new Set(["a", "a","e", "b", "c", "b", "b", "b", "d"]);
console.log(set); //logs Set {"a", "e", "b", "c", "d"}

A Set can’t be accessed like an array, and it provides the same methods as a Map.