Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    function myArray(){
      this.data = [];
      for( var i = 0, e=arguments.length ; i<e; i++) 
        this.data[i] = arguments[i]; 
    }
    myArray.prototype.each = function( fN ){
      for( var i = 0, e=this.data.length ; i<e; i++) fN( this.data[i] , i );
    }
    
    var sum = 0;
    function sumFN( el ){ sum += el; }
    
    var array = [1,2,3,4,5,6,7];
    var myArray = new myArray( 1,2,3,4,5,6,7);
  };
</script>

Test runner

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array.forEach( sumFN );

myArray.each( sumFN );

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