Scramble strings, retaining their readability. This is pointless.

scramble.js

function scramble (message) {
  message = message || ''
  var ret = ''
  var re = /([a-zA-Z]+)|([^a-zA-Z]+)/g
  var match

  while (match = re.exec(message)) {
    if (match[2]) {
      ret += match[2]

      continue
    }

    if (match[1].length < 4) {
      ret += match[1]

      continue
    }

    var piece = match[1].slice(0, 1)

    piece += match[1].slice(1, -1).split('').sort(() => {
      return (0.5 - Math.random())
    }).join('')

    piece += match[1].slice(-1)

    ret += piece
  }

  return ret
}

scramble('There is absolutely no reason anybody would ever want to do this, but I can do it.')

// Outputs:
// Trhee is absuoltely no raeson adnobyy would ever want to do tihs, but I can do it.