JavaScript Map keys() Method Tutorial

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

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