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How much do you know about React refs?

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Questions and Answers

What is the purpose of using refs in React?

To trigger new renders

To update state automatically

To store information without triggering new renders (correct)

To replace state entirely

Which React Hook is used to add a ref to a component?

useRef (correct)

useState

useContext

useEffect

What is a ref in React?

A function that triggers new renders

A variable that is automatically updated by React

A component that stores state

A plain JavaScript object with a mutable "current" property (correct)

How can the value of a ref be accessed?

Through the ref.current property Signup and view all the answers

Does changing a ref's value trigger a component re-render?

No Signup and view all the answers

What can refs be used to point to?

Anything Signup and view all the answers

Can refs be combined with state in a single component?

Yes Signup and view all the answers

When are refs useful for storing information?

Only for information needed by event handlers Signup and view all the answers

What is more appropriate for information needed for rendering?

State Signup and view all the answers

How should refs be used?

With care and safety Signup and view all the answers

Study Notes

Refs in React are used to "remember" information without triggering new renders
The useRef Hook is used to add a ref to a component
The ref is a plain JavaScript object with a mutable "current" property
The ref's value can be accessed through the ref.current property
Changing a ref's value does not trigger a component re-render
Refs can be used to point to anything, not just numbers
Refs can be combined with state in a single component
Refs are useful for storing information only needed by event handlers
State is more appropriate for information needed for rendering
Refs should be used safely and with care.

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Description

Test your knowledge of React refs with this informative quiz! Learn about the benefits of using refs to store information without triggering new renders, how to add a ref with the useRef Hook, and the properties of a ref object. Discover the many use cases for refs, including combining them with state in a single component and using them to store information only needed by event handlers. Brush up on best practices for using refs safely and effectively in your React projects.