It uses VirtualDOM. Follows Unidirectional data flow or data binding Uses reusable/composable UI components to develop the view Increases the application’s performance with Virtual DOM JSX makes code easy to read and write It renders both on client and server side Easy to integrate with other frameworks (Angular, BackboneJS) since it is only a view library Easy to write UI Test cases and integration with tools such as JEST.

What is React?

Difficulty: 1/10

component model, state & lifecycle, virtual DOM

It's a JavaScript library for building user interfaces. It allows developers to create reusable UI components that update efficiently and automatically when data changes. React follows a declarative approach, making it easier to manage the state of an application and render dynamic content.

The major features of ReactJS are as follows:

1
It uses VirtualDOM.
2
Follows Unidirectional data flow or data binding
3
Uses reusable/composable UI components to develop the view
4
Increases the application’s performance with Virtual DOM
5
JSX makes code easy to read and write
6
It renders both on client and server side
7
Easy to integrate with other frameworks (Angular, BackboneJS) since it is only a view library
8
Easy to write UI Test cases and integration with tools such as JEST.

Scenario Questions

0-2 years experience

2-5 years experience

1We have a component that sometimes fails to re‑render after its props change. How would you debug the issue?

What is React?

It's a JavaScript library for building user interfaces. It allows developers to create reusable UI components that update efficiently and automatically when data changes. React follows a declarative approach, making it easier to manage the state of an application and render dynamic content.

Scenario Questions

Follow-up Questions