arr.forEach((item, idx) => {
        if (item == "") {
          switch (idx) {
            case 0:
              console.log("")
              break;
            case 1:
              console.log("")              
              break;
            case 2:
              console.log("")              
              break;
            case 3:
              console.log("")              
              break;
            case 4:
              console.log("")              
              break;
          }
        }
        
      }) now the output is to print out all the empty items. What I want to get is that even if all five item inputs are empty, there is only one printed result 
. Any one will do. Excuse me, how can it be realized? 
