hello-w-dot-dot-dot-wait-what.js

function waitWhat() {
  const [ ,H ] = [].shift.name.toUpperCase();
  const [ e ] = [].every.name;
  const [ l ] = [].lastIndexOf.name;
  const [ o ] = Array.of.name;

  const [ , a ] = false.toString();
  const zero = [].length;
  const space = a.charCodeAt(zero) - a.toUpperCase().charCodeAt(zero);

  const [ ,,,,W ] = [].copyWithin.name;
  const [ r ] = [].reverse.name;
  const [ ,,,d ] = [].find.name;

  const exclame = space + [true].length;

  return H + e + l + l + o
    + String.fromCharCode(space)
    + W + o + r + l + d
    + String.fromCharCode(exclame);
}

console.log(waitWhat());