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10+ Uplers Reactjs Developer Interview Questions and Answers
Q1. why should we use flux instead of grid and vice versa
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
Q2. How you will optimize the performance of react application
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
Q3. What is anti pattern in react?
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
Q4. How to pass data from child to parent
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
Q5. What is meant by props drilling
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.
Q6. How you implement redux in react js
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
Q7. How to optimize react application
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
Q8. What are higher order components
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.
Q9. What is meant by redux
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.
Q10. Diff between state amd props
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
Q11. Explain context Api
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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