Js : multidimensional-array error in nested while half of this still working

Question

Can anyone explain why the 4th sub-array isn't working anymore? I believe because input[(i + 1)] is undefined? But it works for another... I'm a newbie and still learning how to figure out the best option.

function dataHandling(){


    for (var i=0;i < input.length   ; i++){
    for(var j=0; j < input[i].length; j++)
     /*
      if(j === 0){
         console.log("Nomor ID: "+ input[i][j] );
      }
      else if(j=== 1){
        console.log("Name: "+ input[i][j] );
      }
      else if(j=== 2){
        console.log("Birthplace n date: "+ input[i][j] +" " + input[i+1][j+1]);
      }
      else if(j=== 4){
        console.log("Hobby: "+ input[i][j] +"\n" );
      }
      */
     switch(j){
        case 0:
          console.log("Nomor ID: "+ input[i][j] );
          break;

          case 1:
          console.log("Name: "+ input[i][j] );
          break;

          case 2:
          console.log("Birthplace and date: "+ input[i][j] +" " + input[i+1][j+1]);
          break;

          case 3:
         // console.log("birthdate: "+ input[i][j] );
          break;

          case 4:
          console.log("Hobby: "+ input[i][j] +"\n" );
          break;

           default:
        break;
      }


    }

}

 var input = [
                ["0001", "Roman Alamsyah", "Bandar Lampung", "21/05/1989", "Reading"],
                ["0002", "Dika Sembiring", "Medan", "10/10/1992", "Playing Guitar"],
                ["0003", "Winona", "Ambon", "25/12/1965", "Cooking"],
                ["0004", "Bintang Senjaya", "Martapura", "6/4/1970", "Codding"]
              ];

dataHandling(input);

While it works for 1st-3rd arrays, it always errors in the 4th:

Nomor ID: 0003
Name: Winona
Birthplace n date: Ambon 6/4/1970
Hobby: Cooking

Nomor ID: 0004
Name: Bintang Senjaya
TypeError: input[(i + 1)] is undefined <<<

I can understand if since the first i will error but only the 4th of i which not able to read the next sub-array. (Sorry for explaining with a newbie's way, still hard to explain with limited knowledge.)

Feathercrown · Accepted Answer · 2016-11-14 23:32:36Z

First of all, I'd just like to say that you're doing great so far with learning Javascript. The error is you're trying to access the fifth array when i=4 and you use input[i+1][j+1]. Luckily, that isn't even a problem; what you want to do is access the same sub-array, but the next item, so only j should be increased by 1 (input[i][j+1]):

function dataHandling(){


    for (var i=0;i < input.length   ; i++){
    for(var j=0; j < input[i].length; j++)
     /*
      if(j === 0){
         console.log("Nomor ID: "+ input[i][j] );
      }
      else if(j=== 1){
        console.log("Name: "+ input[i][j] );
      }
      else if(j=== 2){
        console.log("Birthplace n date: "+ input[i][j] +" " + input[i+1][j+1]);
      }
      else if(j=== 4){
        console.log("Hobby: "+ input[i][j] +"\n" );
      }
      */
     switch(j){
        case 0:
          console.log("Nomor ID: "+ input[i][j] );
          break;

          case 1:
          console.log("Name: "+ input[i][j] );
          break;

          case 2:
          console.log("Birthplace and date: "+ input[i][j] +" " + input[i][j+1]);
          break;

          case 3:
         // console.log("birthdate: "+ input[i][j] );
          break;

          case 4:
          console.log("Hobby: "+ input[i][j] +"\n" );
          break;

           default:
        break;
      }


    }

}

 var input = [
                ["0001", "Roman Alamsyah", "Bandar Lampung", "21/05/1989", "Reading"],
                ["0002", "Dika Sembiring", "Medan", "10/10/1992", "Playing Guitar"],
                ["0003", "Winona", "Ambon", "25/12/1965", "Cooking"],
                ["0004", "Bintang Senjaya", "Martapura", "6/4/1970", "Codding"]
              ];

dataHandling(input);

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