CODE EXAMPLE FOR JAVASCRIPT

Fake Binary

// Given a string of digits, you should replace any digit below 5 with '0' and any digit 5 and above with '1'. Return the resulting string.
// Note: input will never be an empty string

function fakeBin(x){
  let binary = ''
  x.split('').forEach(letter => Number(letter) < 5 ? binary += 0: binary += 1)
  return binary
}

// With love @kouqhar