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AI solution for React Coding Question on BFE.dev
7. useToggle()

Here's one way to implement useToggle():

import { useState, useCallback } from 'react'

function useToggle(initialState = false): [boolean, () => void] {
  const [state, setState] = useState<boolean>(initialState)

  const toggle = useCallback(() => {
    setState((state) => !state)
  }, [])

  return [state, toggle]
}

The hook returns an array with two elements: the current on state and a toggle function to update it.

Here's how you might use it in App:

function App() {
  const [on, toggle] = useToggle(false)

  return (
    <div>
      <button onClick={toggle}>{on ? 'ON' : 'OFF'}</button>
    </div>
  )
}

Clicking the button will toggle the on state, and the button label will update accordingly. Of course, you can use this hook for other types of components, not just buttons.