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?

<p>Through the ref.current property (D)</p> Signup and view all the answers

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

<p>No (C)</p> Signup and view all the answers

What can refs be used to point to?

<p>Anything (D)</p> Signup and view all the answers

Can refs be combined with state in a single component?

<p>Yes (B)</p> Signup and view all the answers

When are refs useful for storing information?

<p>Only for information needed by event handlers (B)</p> Signup and view all the answers

What is more appropriate for information needed for rendering?

<p>State (B)</p> Signup and view all the answers

How should refs be used?

<p>With care and safety (A)</p> Signup and view all the answers

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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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