Javascript, better way to write an if condition

Question

Is there a concise or better way to write this condition without having to use so many ||.

if (myVar != 'A' && myVar != 'B' && myVar != 'C'){
   ...
}

Answer 1

You can also express it like an array,

if (!['A', 'B', 'C'].includes(myVar)) {
  // if myVar is none of the values in the array
}

edit: added negation to grab the opposite case as your example