javascript-map Archives - GeeksforGeeks

Last Updated: 20 December 2023

In JavaScript, Set and Map are two types of objects that are used for storing data in an ordered manner. Both these data structures are used to store distinct types of dat...read more

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Internal Working of Map in JavaScript

Last Updated: 08 June 2023

The map is a collection of elements where each element is stored as a Key, value pair. Map objects can hold both objects and primitive values as either key or value. In th...read more

Applications of Map in JavaScript

Last Updated: 11 July 2023

Javascript Map is a collection of elements where each element is stored as a Key, value pair. Map objects can hold both objects and primitive values as either key or value...read more

Javascript Map Programming Examples

Last Updated: 16 April 2025

A Javascript map is a collection of elements where each element is stored as a Key, value pair. Map objects can hold both objects and primitive values as either key or val...read more

JavaScript

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javascript-map

Map to Array in JavaScript

Last Updated: 29 June 2023

In this article, we will convert a Map object to an Array in JavaScript. A Map is a collection of key-value pairs linked with each other. The following are the approaches ...read more

How to Add a key/value Pair to Map in JavaScript ?

Last Updated: 10 June 2024

This article will demonstrate how we can add a key-value pair in the JavaScript map. JavaScript Map is a collection of key-value pairs in the same sequence they are insert...read more

JavaScript Program to Update the Value for a Specific Key in Map

Last Updated: 28 May 2024

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 d...read more

JavaScript Program to Combine Values of Two Maps having Same Key

Last Updated: 03 June 2024

In this article, we are going to learn about combining the values of two maps having the same keys in JavaScript, Combining values of two maps with the same key involves m...read more

JavaScript Program to get Key by Value in a Map

Last Updated: 03 June 2024

In this article, we will see how to get a key by a value in a Map in JavaScript.Getting a key by a specific value in a JavaScript Map refers to finding the corresponding k...read more

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How to convert a map to array of objects in JavaScript?

Last Updated: 25 July 2024

A map in JavaScript is a set of unique key and value pairs that can hold multiple values with only a single occurrence. Sometimes, you may be required to convert a map int...read more

How to Convert an Array of Objects to Map in JavaScript?

Last Updated: 23 January 2025

Here are the different methods to convert an array of objects into a Map in JavaScript1. Using new Map() ConstructorThe Map constructor can directly create a Map from an a...read more

Check if a Map is Empty in JavaScript?

Last Updated: 15 April 2025

These are the following ways to check whether the given map is empty or not:1. Using size property - Mostly Usedyou can check if a Map is empty by using its size property....read more

JavaScript

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javascript-map

Interesting Facts About Map in JavaScript

Last Updated: 20 January 2025

JavaScript Map is used to store the data of key-value pairs. It can be used to store any type of value including objects and primitive data types. It is iterable which is ...read more

JavaScript

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javascript-map

JavaScript Map Exercise

Last Updated: 14 November 2024

In JavaScript, a Map is a built-in collection that holds key-value pairs, where keys can be of any data type, including objects, functions, or primitive types. Maps are pa...read more

JavaScript

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javascript-map

How is a JavaScript Hash Map Implemented?

Last Updated: 20 December 2024

A HashMap (also known as a dictionary or hash table in other programming languages) is a collection of key-value pairs Each key in the HashMap is unique, and each key maps...read more