Access parent index in the child element in nested foreach in javascript

Question

var game_board = [
  [1, 2, 3],
  [4, 5, 6],
  [7, 8, 9],
];

(function plot() {
  game_board.forEach((element, i) => {
    element.forEach((value, j) => {
      // access i here
      console.log(j);
    });
  });
})()

I have a multidimensional array and I want to access both indexes i and j.

// access i here you should be able to access i there. Try console.log(i, j) and you'll see both indexes — Nick Parsons
– Nick Parsons, Commented Apr 5, 2020 at 4:26
Second loop is inside the first loop so i is accessible there were you want it — Mosia Thabo
– Mosia Thabo, Commented Apr 5, 2020 at 4:28
What is the problem you're facing ? did you tried accessing i ? — Code Maniac
– Code Maniac, Commented Apr 5, 2020 at 4:31

Nilanka Manoj · Accepted Answer · 2020-04-05 04:32:28Z

1

Actually You have access:

var game_board = [
  [1, 2, 3],
  [4, 5, 6],
  [7, 8, 9],
];

game_board.forEach((element, i) => {
    element.forEach((value, j) => {
      console.log('i : '+i+', j : '+j);
    });
  });

Note: function arguments of parent function is accessible by child function wherever the nested positions are. So, foreach callback function behaves in the same way.

answered Apr 5, 2020 at 4:32

Nilanka Manoj

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Comments

Mosia Thabo · Accepted Answer · 2020-04-05 04:32:39Z

1

Just for illustration:

var game_board = [
  [1, 2, 3],
  [4, 5, 6],
  [7, 8, 9],
];

function plot() {
  game_board.forEach((element, i) => {
    element.forEach((value, j) => {
      // access i here
      console.log(j, i);
    });
  });
}

plot();

answered Apr 5, 2020 at 4:32

Mosia Thabo

4,2871 gold badge18 silver badges27 bronze badges

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