How to use Map.forEach() method In Javascript
In this method, we will iterate the map using map.forEach() method to iterate the key-value pairs and update the value for specific key.
Example: In this example, we will iterate map using forEach method and update the value for a specific key using if condition.
// Creating a map object
let m = new Map([
["a", 100],
["b", 200],
]);
// Display old value
console.log("Old value for key: 'b', " + m.get("b"));
// Iterate and change the required value
m.forEach((value, key) => {
if (key == "b") m.set(key, 1000);
});
// Display updated value
console.log("New value for key: 'b', " + m.get("b"));
Output
Old value for key: 'b', 200 New value for key: 'b', 1000
JavaScript Program to Update the Value for a Specific Key in Map
In this article, we will see different approaches to update the value for a specific key in Map in JavaScript. JavaScript Map is a collection of key-value pairs. We have different methods to access a specific key in JavaScript Map.