In this section, we will learn what the keys() method is and how to use it in JavaScript.

What is JavaScript Map keys() Method?

We use the `keys()` method to get an iterator object that contains all the keys of the target map object.

Note: the iterator object is explained in later sections.

We can then use this method and the for-of statement to loop through all the keys of the target map object.

JavaScript Map keys() Method Syntax:

keys()

keys() Function Parameters:

The method does not take an argument.

keys() Function Return Value:

The return value of this method is an iterator object that contains all the keys of the target map object.

Example: using Map keys() method in JavaScript

const map = new Map();
 map.set("John","222-22222222");
 map.set(22 , 2000);
 map.set(true, false); 
 map.set("Jack", "333-3234232");
 
 for (const key of map.keys()){
   console.log(key);
 }   

Output:

John

22

true

Jack