const SPEED = 700;

const addKeys = obj => {

  obj.keys = Object.keys(obj)

  return obj

}

const wordParts = {

  start: addKeys({

    z: .3,

    zim: .1,

    zz: .1,

    zzz: .1,

    ziz: .05,

    zoo: .1,

    koe: .05,

    kob: .05,

    'cow cow': .1,

    'how ': .02,

    sl: .1,

    ko: .05

  }),

  mid: addKeys({

    i: .1,

    oo: .1,

    a: .1,

    e: .3,

    oe: .1,

    ebobe: .1,

    y: .1

  }),

  end: addKeys({

    z: .3,

    n: .1,

    t: .05,

    rat: .1,

    '!': .05,

    '?': .05,

    '': .1

  })

};

const wordPart = (

    type,

    dupeOdds = .1,

    dupeMax = 8,

    capOdds = .05

  ) => {

  let result = '';

  const part = wordParts[type];

  while (result === '') {

    const choice = part.keys[

      Math.floor(Math.random() * part.keys.length)

    ];

    if (Math.random() < part[choice]) {

      result = choice;

      if (Math.random() < dupeOdds) {

        const dupes = Math.round(

          Math.random() * Math.random() * dupeMax

        );

        result = result.repeat(dupes);

      }

    }

  }

  wordPart.accum += result;

  if (Math.random() < capOdds) {

    wordPart.accum = wordPart.accum.toUpperCase()

  }

  return wordPart;

}

wordPart.accum  = '';

const word = () =>

  wordPart('start')('mid')('end').accum + ' '

document.body.style.fontSize="2em";

setInterval(() => {

  document.body.innerHTML += word();

  wordPart.accum = ''

}, SPEED);