ReactJS Keys

In this tutorial you will learn about the ReactJS Keys and its application with practical example.

ReactJS Keys

In React, keys are helpful when we are dealing with a collection of components or elements. Assigning key to an element or component allows React to uniquely identify it when it has changed, added, or removed. Keys can be assigned to individual elements inside the map() function.

Example:-

Step 1:- Let’s open src/App.js, delete the existing code and put the following code in it and save it.

Step 2:- Let’s open the terminal again, change directory to your project folder and type the following command in order to run the server.

Recommended:-  ReactJS Refs

Step 3:- Now open the following URL in browser to view the output

http://localhost:3000

Step  4:- You will see the following screen.

React Js Keys

In this tutorial we have learn about the ReactJS Keys and its application with practical example. I hope you will like this tutorial.