React Junior

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What is React Router?

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1

React Router is a library for routing in React applications.

2

React Router is a library for managing state in React.

3

React Router is a library for styling React components.

4

React Router is a library for handling side effects in React.

How can you implement routing in a React application?

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1

You can implement routing in React using HTML templates.

2

You can implement routing in React using the useState hook.

3

You can implement routing in React using React Router.

4

You can implement routing in React using CSS styles.

How is React different to React Native?

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1

React Native is a tool for creating CSS stylesheets.

2

React is for mobile applications, while React Native is for web applications.

3

React Native is used for server-side rendering.

4

React is for web applications, while React Native is for mobile applications.

Give an example of how to use the useRef hook.

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1

The useRef hook can be used to access a DOM element directly.

2

The useRef hook is used for state management.

3

The useRef hook is a way to handle side effects.

4

The useRef hook is used for routing in React applications.

Explain the useRef hook.

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1

The useRef hook is used to manage component state.

2

The useRef hook is used for data fetching.

3

The useRef hook returns a mutable ref object.

4

The useRef hook is a way to handle side effects.

Explain the useReducer hook.

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1

The useReducer hook is used for fetching data.

2

The useReducer hook is used for managing complex state logic.

3

The useReducer hook is used for routing in React applications.

4

The useReducer hook is a way to handle side effects.

Explain the useCallback hook.

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1

The useCallback hook is used for component rendering.

2

The useCallback hook returns a memoized callback.

3

The useCallback hook is a way to manage props changes.

4

The useCallback hook is used for handling side effects.

Explain the useMemo hook.

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1

The useMemo hook returns a memoized value.

2

The useMemo hook is used for side effects in React.

3

The useMemo hook is a way to handle state changes.

4

The useMemo hook is used to fetch data from an API.

Explain the useContext hook.

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1

The useContext hook is a method for fetching data.

2

The useContext hook is a way to handle side effects in React.

3

The useContext hook is used for managing component state.

4

The useContext hook allows you to subscribe to React context changes.

What are the differences between useEffect and useLayoutEffect hooks?

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1

The useEffect hook runs after every render, while the useLayoutEffect hook runs synchronously after all DOM mutations.

2

The useEffect hook is used for asynchronous operations, while the useLayoutEffect hook is for synchronous ones.

3

The useEffect hook is used for data fetching, while the useLayoutEffect hook is for event handling.

4

The useEffect hook manages props changes, while the useLayoutEffect hook manages state changes.

Explain the useEffect hook.

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1

The useEffect hook allows you to perform side effects in functional components.

2

The useEffect hook is a method for managing event handlers.

3

The useEffect hook is used to manage component styles.

4

The useEffect hook is a way to create new elements in React.

Explain the useState hook.

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1

The useState hook is a way to handle side effects in React.

2

The useState hook allows you to add state to functional components.

3

The useState hook is used to create context in React.

4

The useState hook is a method for fetching data in React.

What are hooks?

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1

Hooks are methods used for routing in React applications.

2

Hooks are functions that handle HTTP requests in React.

3

Hooks are a way to manage CSS styles in React.

4

Hooks are functions that let you use state and lifecycle features in functional components.

What is the children prop?

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1

The children prop allows components to pass nested elements.

2

The children prop is used to define default values for inputs.

3

The children prop is used to handle events in React components.

4

The children prop is a method for managing component state.

What are props?

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1

Props are inputs to a React component.

2

Props are methods used to fetch data in React.

3

Props are events that can be triggered in React components.

4

Props are the local state of React components.

What is JSX?

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1

JSX is a format for writing CSS styles in React.

2

JSX is a syntax extension for JavaScript used in React.

3

JSX is a type of database used by React applications.

4

JSX is a module bundler for React applications.

What are components in React?

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1

Components are reusable building blocks in a React application.

2

Components are special HTML elements used in React.

3

Components are functions that run on the server in React.

4

Components are external libraries integrated into React applications.

What is React?

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1

React is a JavaScript library for building user interfaces.

2

React is a JavaScript framework for building mobile applications.

3

React is a tool for managing databases in JavaScript.

4

React is a styling library for creating CSS stylesheets.

How can you make API requests in a React application?

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1

You can make API requests in React using HTML templates.

2

You can make API requests in React using CSS styles.

3

You can make API requests in React using the useState hook.

4

You can make API requests in React using the fetch function or Axios.