Vendekin Technologies Reactjs Developer Interview Questions and Answers

Q1. Some of important javascript questions
Add your answer
Q2. On react js like hooks, virtual dom,html5 and html,state, useMemo, useCallback,useEffect
Add your answer
Q3. Box model, css selector
Add your answer
Q4. What are fragments in react js
Ans. 
Fragments in React.js are used to group multiple elements without adding an extra node to the DOM.
• Fragments are a way to group multiple elements without using a wrapper element.

• They help in avoiding unnecessary divs in the DOM.

• Fragments can improve performance by reducing the number of DOM nodes.

• They are useful when returning multiple elements from a component's render method.

• Fragments can be written using the
Answered by AI
View 1 more answer

Q1. Basic Question JS , React JS , Redux
Add your answer

Q1. Basic Javascript, React Js question
Add your answer

React js and JavaScript scenarios based problems.

Q1. Scenario based and General ReactJS and javascript Questions.
Add your answer

Q1. About CI-CD , JS browser working ,
Add your answer
Q2. React basics like working and jsx
Add your answer

Q1. What is a single page appliction?
Ans. 
A single page application is a web application that loads once and dynamically updates the content without refreshing the page.
• Loads once and dynamically updates content

• No page refreshes

• Uses JavaScript frameworks like React to handle routing and rendering

• Improves user experience by providing a seamless and responsive interface
Answered by AI
View 3 more answers
Q2. What are the advantages of react?
Ans. 
React provides efficient and flexible UI rendering, component reusability, and easy integration with other libraries.
• Virtual DOM allows for faster rendering and improved performance

• Component-based architecture promotes reusability and modularity

• Easy integration with other libraries and frameworks like Redux and React Native

• JSX syntax allows for easy creation of complex UI components

• React community provides a vast array
Answered by AI
Add your answer
Q3. What is useMemo and its usecases
Ans. 
useMemo is a hook in React that memoizes the result of a function and returns the cached value on subsequent renders.
• useMemo is used to optimize performance by avoiding unnecessary re-renders.

• It takes two arguments: a function and an array of dependencies.

• The function is only re-executed if any of the dependencies change.

• Common use cases include expensive calculations, filtering, and sorting.

• Example: useMemo(() => calc
Answered by AI
Add your answer
Q4. What are functional components
Ans. 
Functional components are a type of React component that are defined as a function rather than a class.
• They are simpler and easier to read than class components.

• They don't have state or lifecycle methods.

• They receive props as an argument and return JSX.

• They are often used for presentational components.

• They can use React hooks to manage state and lifecycle.

• Example: const MyComponent = (props) => { return

  {props.text}
  }
Answered by AI
Add your answer

Q1. Difference between let,var and const
Ans. 
let, var, and const are all used for variable declaration in JavaScript, but they have different scopes and behaviors.
• let has block scope, var has function scope, and const is a constant that cannot be reassigned.

• Using let allows you to declare variables that are limited to the scope of a block statement.

• var variables are hoisted to the top of their function scope.

• const variables must be initialized with a value and ca
Answered by AI
Add your answer