I don't understand that

[shehabHassan]

const arr = [
[1, 2, 3],
[4, 5, 6],
[7, 8, 9],
[[10, 11, 12], 13, 14]
];

const subArray = arr[3,1];
console.log(subArray);
what’s rule so i can prefer to 13.
and what’s meaning of this [[10, 11, 12], 13, 14] and thanks.

[colinthornton]

const arr = [
  [1, 2, 3],
  [4, 5, 6],
  [7, 8 , 9],
  [
    [10, 11, 12],
    13,
    14,
  ],
];

arr is an array.

Its first item is [1, 2, 3]
Its second item is [4, 5, 6]
Its third item is [7, 8, 9]
Its fourth item is [[10, 11, 12], 13, 14]

The first three items are all arrays of numbers. The fourth item is a little different. Its first item is another array of numbers, while the following items (13 and 14) are simply numbers.

[Mullin89]

Hi,

I think you are asking how you would access the element ‘13’ in the ‘arr’ variable? If so, you are just slightly off with the syntax:

const subArray = arr[3,1] should be const subArray = arr[3][1]

I hope that helps!