Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    
        function apply(array, items){
            array.push.apply(array, items)
        }
        
        function loop(array, items){
            
            var i = 0,
                l = items.length,
                nl = array.length;
                
            for(; i < l; i++)
                array[nl++] = items[i];
        }
    
  };
</script>

Test runner

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var a = [1];
apply(a, [2,3,4,5]);
 

var a = [1];
loop(a, [2,3,4,5]);

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