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();
GFGMap.set(1, "India" );
console.log(GFGMap.get(1));
GFGMap.set(1, "England" );
console.log(GFGMap.get(1));
</script>
|
Output :
India
England
Example 2: Using set() with chaining
Javascript
<script>
let myMap = new Map();
myMap.set(1, "Rohan" ).set(2, "Sohan" ).set(3, "Trojan" );
console.log(myMap.get(1));
console.log(myMap.get(2));
console.log(myMap.get(3));
</script>
|
Output :
Rohan
Sohan
Trojan
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