Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var testUsers = ["Josh", "Calvin", "Ming", "Ben"],
        users = [],
        groups = [],
        group = [],
        user, i, length;
    
    // generate random users
    for (i = 0; i < 25; i++) {
      users[users.length] = testUsers[Math.round(Math.random() * 3)];
    }
  };
</script>

Test runner

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for (i in users) {
  user = users[i];

  if (group.length == 3) {
    groups.push(group);
    group = [];
  }

  group.push(user);
}

groups.push(group);

for (i = 0, length = users.length; i < length; i++) {
  user = users[i];

  if (group.length == 3) {
    groups.push(group);
    group = [];
  }

  group.push(user);
}

groups.push(group);

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