How do you make a button show a + (plus sign) when not clicked, and – (minus sign) when clicked?

Please see code below.

const [expanded, setExpanded] = useState(false);

const toggleExpanded = () => setExpanded(!expanded);

<button className="plus" onClick={toggleExpanded}> + </button>

Answers:

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Method 1

You can do something like this:
https://codesandbox.io/embed/inspiring-dhawan-1z3dbx?fontsize=14&hidenavigation=1&theme=dark

function main () {
  const [Sign, setSign] = useState('+')
  function handleClick () {
    if (Sign === '+') setSign('-')
    else setSign('+')
  }
  return <button onClick={handleClick}>{Sign}</button>
}

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0