Everything About React Interview

It's becoming more difficult to choose the correct technology for creating an app or a website. These days, the trend in the market is react. React is currently the most popular front-end technology, with more and more businesses adopting it. Being a React.js expert is one thing, but getting through a React.js interview is quite another.

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In this article, We are going to list some of the most important ReactJS Interview Questions in 2023 which will set you apart in the interview process.

We are going to understand the fundamentals and building blocks of React by answering the most frequently asked interview questions.

What is React?

React is a JavaScript library created by Facebook. React is a User Interface (UI) libr-
ary. React is a tool for building UI comp-
onents

JSX

It is called JSX, and it is a syntax extension to JavaScript. We recommend using it with
React to describe what the UI should look
like.

Virtual DOM

A virtual DOM object has the same properties as a real DOM object, but it lacks the real thing's power to directly change what's on the screen.

Components in React

A JavaScript function is a piece of code that performs a certain task. When "something" calls a JavaScript function, it is executed.

State in React

The state is an instance of React Component Class can be defined as an object of a set of observable properties that control the
behavior

Props in React

It is an object which stores the value of attributes of a tag and work similar to the
HTML attributes.

Router in React

React Router is a lightweight, fully-featured routing library for the React JavaScript library. React Router runs everywhere that React runs

React Hooks

Hooks are functions that let you “hook into” React state and lifecycle features from function components.

Lifecycle of React

Each component in React has a lifecycle
which you can monitor and manipulate
during its three main phases.

React Redux

Splice() is used to add or remove an element
in a array, and it would modify the origin array. Slice and splice are two useful JavaScript methods for working with JavaScript methods