Recursion from Scratch - reversing a string

reverse.js

const reverse = string => {
  // the reverse of an empty string is: just an empty string
  if (string === '') return ''

  // the reverse of any other string is:
  // the reverse of the rest of the string + the first character at the end
  const firstCharacter = string.slice(0, 1)
  const theRest = string.slice(1)
  return reverse(theRest) + firstCharacter
}