Pronounceable Random String function

pronounceableRandomString.js

// returns a random string that is english-ish.
// if no params passed, will return a lowercase string between 3 and 8 letters.
// 1st arg option to pass in boolean for caplitalizing first letter for proper names (default false)
// 2nd arg option to pass in min chars (default 3)
// 3rd arg option to pass in max chars (default 8)

function pronounceableRandomString(cap, min, max) {
  
  function randBetween(min, max) {
    return Math.floor(Math.random()*(max-min+1)+min);
  }
  
  var minChars = min || 3;
  var maxChars = max || 8;
  var capitalize = cap == false ? false : true;
  
  if (typeof capitalize !== "boolean" || typeof minChars !== "number" || typeof maxChars !== "number") {
    return "Err: Bad Args";
  }
  
  if (minChars > maxChars) return "Err: Num Chars";
  
  var chars = randBetween(minChars,maxChars);
  var pattern = randBetween(0,2);
  var str = "";

  var vowelChunk = [
    'a','a','a','a','a','a','a','a','a','a',
    'e','e','e','e','e','e','e','e','e','e',
    'o','o','o','o','o','o','o','o','o','o',
    'i','i','i','i','i','u','u','u','u','u',
    'ae','ai','au','aa','ea','ee','ei','eu','ia','ie',
    'io','ua','ue','ui','uo','eau','oa','oi','ou','ea'
  ];

  var firstConsonentChunk = [
    'b','c','d','f','g','h','j','k','l','m',
    'n','n','p','q','r','s','t','u','v','x',
    'y','z','ch','sh','ph','th','st','str','sk','sp',
    'kr','cl','qu','fr','bl','pl','tr','tw','dr','br',
    'gh','gr','gl','pr','zh','fl','cl','cr','chr','spr',
    'r','s','t','l','n','r','s','t','l','n'
  ];

  var consonentChunk = [
    'b','c','d','f','g','h','j','k','l','m',
    'n','n','p','q','r','s','t','u','v','x',
    'y','z','ch','sh','ph','th','st','str','sk','sp',
    'ss','tt','qu','mm','nn','gg','tr','rt','lt','ft',
    'gh','rg','dd','rp','ll','ck','rf','cr','chr','spr',
    'r','s','t','l','n','r','s','t','l','n'
  ];

  if(pattern < 2 ) {
    str = firstConsonentChunk[randBetween(0,firstConsonentChunk.length - 1)] +
      vowelChunk[randBetween(0,vowelChunk.length - 1)] +
      consonentChunk[randBetween(0,consonentChunk.length - 1)] +
      vowelChunk[randBetween(0,vowelChunk.length - 1)] +
      consonentChunk[randBetween(0,consonentChunk.length - 1)];
  } else {
    str = vowelChunk[randBetween(0,vowelChunk.length - 1)] +
      consonentChunk[randBetween(0,consonentChunk.length - 1)] +
      vowelChunk[randBetween(0,vowelChunk.length - 1)] +
      consonentChunk[randBetween(0,consonentChunk.length - 1)] +
      vowelChunk[randBetween(0,vowelChunk.length - 1)];
  }

  if (capitalize) {
    str = str.charAt(0).toUpperCase() + str.slice(1);
  }

  str = str.substr(0,chars);

  return str;
};