Cloud4C Reactjs Developer Interview Questions and Answers

Q1. Basic react interview question like lifecycle methods and about hooks
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Q2. Javascript interview questions like hoisting, closures, function currying and es6 features.
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Q3. Function to flatten and sort an array
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Q1. Basic scrum related questions
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Q2. Challenges faced
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Q3. Function to find the occurrences of the word in a string
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Q1. Basics of Javascript
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Q2. Basics of React
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Q1. Routing concept
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Q2. React js coding question
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Hacker earth test with 29 MCQs and 1 Coding Question

Q1. Basic reactjs Questions with some javascript coding snippets
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Q1. What are hooks in reactjs?
Ans. 
Hooks are a new feature in React 16.8 that allow you to use state and other React features without writing a class.
• Hooks are functions that let you use state and other React features in functional components.

• They allow you to reuse stateful logic without changing your component hierarchy.

• Some built-in hooks include useState, useEffect, useContext, etc.

• Hooks provide a more direct API to the React concepts you already kn...read more
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Q2. What is pure component?
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Pure component is a class component that does not re-render if the input props and state remain the same.
• Pure components implement shouldComponentUpdate method with shallow prop and state comparison.

• They are optimized for performance as they prevent unnecessary re-renders.

• Example: class MyComponent extends React.PureComponent { // component code here }
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Q3. What is modules in javascript?
Ans. 
Modules in JavaScript are reusable pieces of code that can be exported from one file and imported into another.
• Modules help in organizing code into separate files for better maintainability.

• Modules can be imported using 'import' keyword and exported using 'export' keyword.

• Modules can be used to encapsulate code and prevent global namespace pollution.

• CommonJS and ES6 modules are two popular module systems in JavaScript.
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Q4. What is the difference between rem and em in css? How to hide something in CSS?
Ans. 
rem and em are both units in CSS for defining font sizes, with rem being relative to the root element and em being relative to the parent element.
• rem stands for 'root em' and is relative to the font size of the root element (usually the tag)

• em stands for 'element em' and is relative to the font size of the parent element

• To hide something in CSS, you can use the display property with a value of 'none' or the visibility...read more
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Q1. What is Event loop
Ans. 
Event loop is a mechanism in JavaScript that allows for asynchronous operations to be executed in a non-blocking way.
• Event loop is responsible for handling asynchronous operations in JavaScript.

• It allows for non-blocking execution of code by moving asynchronous tasks to the event queue.

• Event loop continuously checks the call stack and the event queue, moving tasks from the queue to the stack when the stack is empty.

• Exa...read more
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Q2. What are closures
Ans. 
Closures are functions that have access to their own scope, as well as the scope in which they were defined.
• Closures allow functions to access variables from their outer scope even after the outer function has finished executing.

• They are commonly used to create private variables in JavaScript.

• Closures are created whenever a function is defined within another function.
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