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10+ Uplers Reactjs Developer Interview Questions and Answers

Updated 4 Jul 2024

Q1. why should we use flux instead of grid and vice versa

Ans.

Flux is a design pattern for managing data flow in React applications, while Grid is a layout system for organizing content.

  • Flux is useful for managing complex data flow in large applications, ensuring data consistency and predictability.

  • Grid is useful for creating responsive layouts and organizing content in a visually appealing way.

  • Flux helps in maintaining a unidirectional data flow, making it easier to debug and understand the application logic.

  • Grid helps in creating cons...read more

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Q2. How you will optimize the performance of react application

Ans.

Optimizing performance of React application involves code splitting, lazy loading, minimizing bundle size, using memoization, and optimizing render methods.

  • Implement code splitting to load only necessary code for each route or component.

  • Utilize lazy loading to load components only when they are needed.

  • Minimize bundle size by removing unnecessary dependencies and using tools like Webpack Bundle Analyzer.

  • Use memoization techniques like React.memo or useMemo to prevent unnecessa...read more

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Q3. What is anti pattern in react?

Ans.

An anti-pattern in React is a common mistake or bad practice that should be avoided.

  • Using index as key in lists can cause issues with component re-rendering

  • Using setState in a loop can lead to unexpected behavior

  • Not using PureComponent or memoization for performance optimization

  • Overusing context instead of props drilling can make code harder to maintain

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Q4. How to pass data from child to parent

Ans.

Using callback functions or props to pass data from child to parent in React

  • Use callback functions to pass data from child to parent

  • Pass data as props from child component to parent component

  • Utilize state management libraries like Redux to pass data between components

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Q5. What is meant by props drilling

Ans.

Props drilling is the process of passing props from a parent component to multiple levels of nested child components.

  • Props drilling can lead to a lot of unnecessary passing of props through intermediate components.

  • It can make the code harder to maintain and understand.

  • One way to avoid props drilling is by using React Context API or Redux for managing global state.

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Q6. How you implement redux in react js

Ans.

Redux is implemented in React by creating a store, defining actions, creating reducers, and connecting components.

  • Create a Redux store using createStore() function from 'redux' package

  • Define actions as plain objects with a 'type' property

  • Create reducers to specify how the state changes in response to actions

  • Connect components to the Redux store using connect() function from 'react-redux' package

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Q7. How to optimize react application

Ans.

Optimizing a React application involves code splitting, lazy loading, using memoization, minimizing re-renders, and optimizing network requests.

  • Implement code splitting to load only necessary code for each route or component.

  • Use lazy loading to load components only when they are needed.

  • Memoize expensive calculations or functions using useMemo or useCallback.

  • Minimize re-renders by using shouldComponentUpdate or React.memo.

  • Optimize network requests by reducing unnecessary calls...read more

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Q8. What are higher order components

Ans.

Higher order components are functions that take a component and return a new component with additional functionality.

  • Higher order components are used for code reuse and logic sharing.

  • They allow you to abstract common logic into a reusable component.

  • Examples include components that handle authentication, data fetching, or styling.

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Q9. What is meant by redux

Ans.

Redux is a predictable state container for JavaScript apps.

  • Redux is a state management library for JavaScript applications.

  • It helps in managing the state of the application in a predictable way.

  • Redux follows a unidirectional data flow pattern.

  • Actions are dispatched to update the state in the store.

  • Components can subscribe to the store to get updates.

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Q10. Diff between state amd props

Ans.

State is mutable and controlled by the component itself, while props are immutable and passed down from parent components.

  • State is managed within a component and can be changed using setState() method

  • Props are passed down from parent components to child components

  • State can be updated and re-render the component, while props are read-only

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Q11. Explain context Api

Ans.

Context API is a feature in React that allows sharing data between components without having to pass props through every level of the component tree.

  • Context API provides a way to pass data through the component tree without having to pass props down manually at every level.

  • It is useful for passing global data like themes, user authentication, etc. to multiple components.

  • Context API consists of three main parts: Provider, Consumer, and useContext hook.

  • Example: Creating a theme...read more

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