javascript - How to set rules for math.random function? -


this code below.it randomly generate sequence of 11 characters array. work correctly, need follow rules, not repeat same string, , not repeat l , l' (or) r , r' (or) u , u' (or) b , b' consecutively. please try me. 

</head> <body>     <script type="text/javascript">  function makeid(){     var text = ""; var possible = new array("r", "r'", "l", "l'", "b", "b'");  for( var i=0; < 11; i++ )     //text += possible.charat(math.floor(math.random() * possible.length));  text += possible[(math.floor(math.random() * possible.length))]; return text;   // alert(math.floor(math.random() * possible.length)); }          </script>         <a href="javascript:makeid()">alert random letter</a>         <div>             <span id="txt">              </span>         </div>                 </body>

to "set rules" need split individual pairs , use last variable make sure don't select same random value again.

for rubik's cube scrambler need use like:

var out = [], last = -1, p = [["r", "r'"], ["l", "l'"], ["b", "b'"], ["u", "u'"], ["f", "f'"], ["d", "d'"]], num = 11; while(out.length !== num){     rand = math.floor(math.random() * p.length);     if(rand !== last){         last = rand;         out.push(p[rand][math.floor(math.random() * p[rand].length)]);     } } return out.join(' ');

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