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JavaScript Map set() Method
  • Last Updated : 08 Mar, 2021

The map.set() method is used to add key-value pairs to a Map object. It can also be used to update the value of an existing key. Each value must have a unique key so that they get mapped correctly.

Syntax:

GFGmap.set(key, value);

Parameters: This method accepts two parameters as mentioned above and described below:

  • Key: This is the key of the item that has to be added or updated in the Map.
  • Value: This is the value of the item that has to be added or updated in the Map.

The examples below illustrate the set() method:

Example 1:



Javascript




<script>
  let GFGMap = new Map();
  
  // Adding a key value pair
  GFGMap.set(1, "India");
  
  // Getting the value by key
  console.log(GFGMap.get(1));
  
  // Updating the existing value
  GFGMap.set(1, "England");
  
  // Getting the value back
  console.log(GFGMap.get(1));
</script>

Output :

India
England

Example 2: Using set() with chaining

Javascript




<script>
  let myMap = new Map();
  
  // Adding key value pair with chaining
  myMap.set(1, "Rohan").set(2, "Sohan").set(3, "Trojan");
  
  // Getting the values back
  console.log(myMap.get(1));
  console.log(myMap.get(2));
  console.log(myMap.get(3));
</script>

Output :

Rohan
Sohan
Trojan
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