[ Live ] React JS Interview 🤯 | Frontend UI Questions 🤒

TL;DR

Learn about the difference between State and Props in React and how to use them in functional components.

Transcript

what is the functional component uh so so see you can use the name Tony Stark why did you do export default so so uh basically uh do you see there is a bug in your app bug in my app but can you please improve your code a little no no no it is not a good way something uh random is happening over here okay okay I got it I got it got it got it got it ... Read More

Key Insights

• 😒 Functional components in React use the useState hook to manage state variables.
• 👻 State variables allow components to store and update data internally.
• 👪 Props are used to pass data from a parent component to its child component.
• 😀 The create-react-app package provides an efficient way to set up new React projects.
• 👨‍💻 Bundlers like Webpack are used to compile and package the code in a React project.
• 👻 The public and node_modules folders play important roles in hosting and managing dependencies in a React project.
• 😒 It is essential to understand the difference between State and Props and use them correctly in React components.

Questions & Answers

Q: What is the difference between State and Props in React?

State is used to manage and update data within a component, while props are used to pass data from a parent component to its child component.

Q: How can you create a new React project?

You can use the create-react-app package to create a new React project by running the command "npx create-react-app [project-name]".

Q: What is the purpose of the public and node_modules folders in a React project?

The public folder contains files necessary for hosting the React application, such as favicon.ico and robots.txt. The node_modules folder contains all the JavaScript packages and dependencies used in the project.

Q: What is the role of bundlers in a React project?

Bundlers like Webpack are responsible for compiling and packaging the JavaScript code, CSS, and other assets of a React project. They allow developers to write modular code and manage dependencies efficiently.

Key Insights:

• Functional components in React use the useState hook to manage state variables.
• State variables allow components to store and update data internally.
• Props are used to pass data from a parent component to its child component.
• The create-react-app package provides an efficient way to set up new React projects.
• Bundlers like Webpack are used to compile and package the code in a React project.
• The public and node_modules folders play important roles in hosting and managing dependencies in a React project.
• It is essential to understand the difference between State and Props and use them correctly in React components.
• The use of keys in mapped components helps optimize rendering and distinguish unique elements.

Summary & Key Takeaways

• State and props are two important concepts in React for managing and passing data within components.

• State is used for managing and updating data within a component, while props are used for passing data from a parent component to its child component.

• You can use the useState hook in React to create and update state variables, and props are received as parameters in functional components.

• When creating React applications, you can use the create-react-app package to set up a project with ready-to-use configurations, bundlers, and testing setups.

• Public and node_modules folders are created by the create-react-app package and contain files and dependencies necessary for running and building the project.