Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    // array each
    Array.prototype.myEachArray = function( fN ){
      for( var i = 0, e=this.length; i<e; i++ ){
       fN( this[i], i );
      }
    }
    
    // matrix each
    Array.prototype.myEachMatrix = function( fN ){
      for( var i = 0, e=this.length; i<e; i++ ){
       for( var i2 = 0, e2=this[i].length; i2<e2; i2++ ){
        fN( this[i][i2], i, i2 );
       }
      }
    }
    
    // fun style each for array
    function myEachArray( a, fN ){
     for( var i = 0, e=a.length; i<e; i++ ){
      fN( a[i], i );
     }
    }
    
    // fun style each for matrix
    function myEachMatrix( a, fN ){
     for( var i = 0, e=a.length; i<e; i++ ){
       for( var i2 = 0, e2=a[i].length; i2<e2; i2++ ){
         fN( a[i][i2], i, i2 );
       }
     }
    }
    
    // fun style each 
    function myEach( a, fN ){
     if( a.__struct__ === 'matrix' ){
      for( var i = 0, e=a.length; i<e; i++ ){
       for( var i2 = 0, e2=a[i].length; i2<e2; i2++ ){
         fN( a[i][i2], i, i2 );
       }
      }
     }
     else if( a.__struct__ === 'array' ){
      for( var i = 0, e=a.length; i<e; i++ ){
       fN( a[i], i );
      }
     }
    }
    
    array = [1,2,3,4,5,6,7,8,9,10];
    sArray = [1,2,3,4,5,6,7,8,9,10];
    sArray.__struct__ = 'array';
    
    matrix = [[1,2,3,4,5,6,7,8,9,10],[1,2,3,4,5,6,7,8,9,10]];
    sMatrix = [[1,2,3,4,5,6,7,8,9,10],[1,2,3,4,5,6,7,8,9,10]];
    sMatrix.__struct__ = 'matrix';
    
    sum = 0;
    function sumFN( el , i ){ sum += el; }
  };
</script>

Test runner

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//array.myEachArray( sumFN );
matrix.myEachMatrix( sumFN );

//myEachArray( array, sumFN );
myEachMatrix( matrix, sumFN );

//myEach( sArray, sumFN );
myEach( sMatrix, sumFN );

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