Make text look kile triwten by a person with dysgraphia or dyslexia.

function dyslectize(text, wordTrehslod, letterTreshhold) {

	wordTrehslod = wordTrehslod || 0.3;
	letterTreshhold = letterTreshhold || 0.5;
  
	var words = text.split(" ");  

  function isVowel(letter) {
    var vowels = "aeiouy";
  	return vowels.indexOf(letter.toLowerCase()) > -1;
  }
  
  function shuffleArray(array) {
    for (var i = array.length - 1; i > 0; i--) {
        var j = Math.floor(Math.random() * (i + 1));
        var temp = array[i];
        array[i] = array[j];
        array[j] = temp;
    }
    return array;
	}
  words.forEach(function(word, index){
  
  	if (Math.random() > wordTrehslod) {
      var letters = word.split("");
      var firstUpperCaseLetter = letters[0] === letters[0].toUpperCase();
      var swappable = [];
      letters.forEach(function(letter, index){

          if (letter.match(/[a-z]/i) && !isVowel(letter) &&  Math.random() > letterTreshhold ) {
            swappable.push(index);
          }

      });

      var newSwappable = shuffleArray(swappable.concat());
      var ll = letters.concat();
      newSwappable.forEach(function(item, index){
          letters.splice(swappable[index], 1, ll[item]);
      });
      
      words[index] = letters.join("").toLowerCase();
            
      if (firstUpperCaseLetter) {
      	words[index] = words[index].substr(0, 1).toUpperCase() + words[index].substr(1);
      }
    
    }
    
  });

	return words.join(" ");
}