equillibrium position of an arrray

function equilibrium(arr, n)
{
         var i, j;
         var leftsum, rightsum;
          
         
         for(i = 0; i < n; ++i)
         {
          
            
             leftsum = 0;
              for(let j = 0; j < i; j++)
              leftsum += arr[j];
               
             
              rightsum = 0;
              for(let j = i + 1; j < n; j++)
              rightsum += arr[j];
               
             
          
              if(leftsum == rightsum)
                 return i;
         }
          
            return -1;
}