CitiusTech React Developer Interview Questions and Answers

Round duration - 60 minutes
Round difficulty - Medium

Technical round with questions based on React JS.

Q1. React Question
What is props?
Ans. 
Props is the shorthand for Properties in React. They are read-only components which must be kept pure i.e. immutable. They are always passed down from the parent to the child components throughout the application. A child component can never send a prop back to the parent component. This help in maintaining the unidirectional data flow and are generally used to render the dynamically generated data.
Answered by CodingNinjas
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Q2. React Question
How does Redux work?
Ans. 
The core concepts of Redux — Store, Actions, Reducers, and Subscriptions.
Initial State
The initial state is what it looks like at the start.
Actions/Dispatches
With Redux, every action can alter the initial state — which means anything you do can change something around you. Every time an action takes place, it’s called being dispatched. 
Reducers 
Reducers take in the argument of the state set to the default init...read more
Answered by CodingNinjas
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Q3. React Question
What is Redux?
Ans. 
Redux is a way to manage the “state” or we can say it is a cache or storage that can be accessed by all components with a structured way. It has to be accessed through a “Reducer” and “Actions”. Redux creates a process and procedures to interact with the store so that components will not just update or read the store randomly.
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Q4. React Question
Difference between Functional Components and Class Components
Ans. 
1. A functional component is just a plain JavaScript function that accepts props as an argument and returns a React element. A class component requires you to extend from React. Component and create a render function which returns a React element.
2. There is no render method used in functional components. Class components must have the render() method returning HTML
3. React lifecycle methods (for example, componentDidM...read more
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DSA based on any general language prefer C++

Q1. DBMS, BST, Sieve of Erathnus, Dynamic Programming
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Q2. Debugging c++ code
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Q3. OOPS based question
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Q1. General questions and some questions on personality
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Q1. Basics of Javascript
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Q2. Basics of React
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Q1. Basics about angular
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Q2. Javascript concepts
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Q1. How react native works under the hood?
Ans. 
React Native works by running JavaScript code on a separate thread and communicating with native modules through a bridge.
• React Native runs JavaScript code on a separate thread called the JavaScript thread.

• It communicates with native modules through a bridge, which allows JavaScript to interact with platform-specific APIs.

• The bridge passes messages between the JavaScript thread and the native modules, enabling seamless...read more
Answered by AI
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Python code for solving a string usecase using stack, SQL join and groupby queries

Basic React related questions

A coding assignment using JavaScript and bootstrap

Q1. Basic behavioural questions in this round
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