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<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>

<script id="jsbin-javascript">
/**
 * Randomize array element order in-place.
 * Using Durstenfeld shuffle algorithm.
 */
var array=['a','b','c','d','e','f'];
// 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;
// }
// shuffleArray(array);
  var groupa =[];
  var groupb=[];
  for(var i=0; i<=array.length-1; i++){
    if(i<array.length/2){
       groupa.push(array[i])
    } else{
      groupb.push(array[i])
    }

  }
  console.log("groupa = "+ groupa)
  console.log("groupb = "+ groupb)
function showMatches(group){
 for(var i=0;i<=group.length-1;i++){
  for(var j=i+1;j<=group.length-1;j++){
    console.log("Matches--> " + group[i] +" Vs " + group[j]);

  }
 }
}

showMatches(groupa);
showMatches(groupb);
</script>


<script id="jsbin-source-javascript" type="text/javascript">/**
 * Randomize array element order in-place.
 * Using Durstenfeld shuffle algorithm.
 */
var array=['a','b','c','d','e','f'];
// 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;
// }
// shuffleArray(array);
  var groupa =[];
  var groupb=[];
  for(var i=0; i<=array.length-1; i++){
    if(i<array.length/2){
       groupa.push(array[i])
    } else{
      groupb.push(array[i])
    }

  }
  console.log("groupa = "+ groupa)
  console.log("groupb = "+ groupb)
function showMatches(group){
 for(var i=0;i<=group.length-1;i++){
  for(var j=i+1;j<=group.length-1;j++){
    console.log("Matches--> " + group[i] +" Vs " + group[j]);

  }
 }
}

showMatches(groupa);
showMatches(groupb);

</script></body>
</html>