// a sample 2-D array   
var a = [[1, 2, 1, 24], [8, 11, 9, 4], [7, 0, 7, 27], [7, 4, 28, 14], [3, 10, 26, 7]];  
   
for (var i in a)   
{  
   console.log("row " + i);  
   for (var j in a[i])   
     {  
      console.log(" " + a[i][j]);  
     }  
}