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
