Preparation code

      
      <script>

        Benchmark.prototype.setup = function() {

          
  var collisionCount = 0;
  var couple = [];
  for(var i = 0 ; i < 100; i++){
  	couple.push({x:Math.random(),y:Math.random()});
  }
  
  //Note: try and catch of a() and c() have the exact same code.
  
  a = function(){
  	try {
           for(var i = 0 ; i < couple.length; i++){
               for(var j = 0 ; j < couple.length; j++){
                  var vx = couple[i].x-couple[j].x;
                  var vy = couple[i].y-couple[j].y;
                  if(vx*vx + vy*vy < 0.1)
                     collisionCount++;
               }
           }
  	} catch(err){
  	
  	}
  }
  b = function(){
  	try {
          c();
  	} catch(err){
  	
  	}
  }
  c = function(){
       for(var i = 0 ; i < couple.length; i++){
           for(var j = 0 ; j < couple.length; j++){
              var vx = couple[i].x-couple[j].x;
              var vy = couple[i].y-couple[j].y;
              if(vx*vx + vy*vy < 0.1)
                 collisionCount++;
           }
       }
  }
        
  };


      
</script>
    

Test runner

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a();

b();

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