const curry = (fn) => {
  return function curried(...args) {
    const done = args.length >= fn.length
    if (done) {
      return fn.apply(this, args)
    } else {
      return (...args2) => curried.apply(this, [...args, ...args2])
    }
  }
}

// This is invalid because it uses ...args.  The curry does not understand where to stop
function func(...args) {
  //
}

const currying = curry(func)