Extended Web AppTech Interview Questions and Answers

Q1. What are closures
Ans. 
Closures are functions that have access to variables from their containing scope even after the parent function has finished executing.
• Closures allow functions to 'remember' the environment in which they were created

• They can access variables from their outer function even after the function has returned

• Closures are commonly used in event handlers and callbacks
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Q1. What are high order functions in react js explain with an example
Ans. 
High order functions in React JS are functions that take other functions as arguments or return functions as their output.
• High order functions allow for code reusability and cleaner code structure.

• An example of a high order function in React JS is the map function, which takes a function as an argument to transform elements in an array.

• Another example is the filter function, which takes a function as an argument to fil...read more
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Q1. Questions on method overloading and overriding topics also some annotations on spring and sprungboot
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Print the even count digits of number in to two parts

Q1. Technical questions from basic to API in springboot
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MCQ test based on HTML, CSS JAVASCRIPT and NodeJs

System test based on NodeJs
Question write crud operations

Q1. Questions based on Resume
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Q1. What are hooks how to use them list them
Ans. 
Hooks are a feature in React that allow you to use state and other React features in functional components.
• Hooks are functions that let you use state and other React features in functional components.

• Some commonly used hooks are useState, useEffect, useContext, and useRef.

• useState hook is used to add state to functional components.

• useEffect hook is used to perform side effects in functional components.

• useContext hook i...read more
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Q2. What are the lifecycle methods
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Lifecycle methods are methods that are called automatically at specific points in a component's lifecycle.
• componentDidMount() - called after the component is rendered for the first time

• componentDidUpdate() - called after the component's updates are applied

• componentWillUnmount() - called before the component is removed from the DOM
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Q3. Create a react project and fetch data from api and display it
Ans. 
Create a React project to fetch and display data from an API
• Set up a new React project using create-react-app

• Use the fetch API or axios to make a request to the desired API

• Store the fetched data in state using useState hook

• Render the data on the UI using JSX
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