用Javascript将数据追加到多维数组

Question

I am writing PHP code around into Node.js and I have come to halt on part where program is dealing with multidimensional arrays.

In PHP I got this (removed for loop to simplify it):

$tables = [];
$left_over_array = [34, 35, 36, 37];
$round = 0;
$row = 0;
$tables['round_'.$round][$row][]=$left_over_array[0];
$tables['round_'.$round][$row][]=$left_over_array[1];
$tables['round_'.$round][$row+3][]=$left_over_array[0];
$tables['round_'.$round][$row+3][]=$left_over_array[1];

Edit: $row value is not in 0,1,2,3 but maybe in 0, 1, 10, 3, 12 order.

Outcome of PHP code would look something like this:

$tables = [
              'round_0'=>[
                  '0'=>[
                      0=>34,
                      1=>35
                  ],
                  '3'=>[
                      0=>36,
                      1=>37
                  ],
               ]
          ]

Later I need to access this data. When I have it in this structure I can simply do $tables['round_0'][3][1] to get value 36

My question is, how to achieve same thing with Javascript? or should I instead use objects? and then how do I do same thing with object

Answer 1

Javascript associative arrays have to be declared as objects, and the key have to exist before you try to put anything inside of it.

So, following my code, I prepared a loop from 0 to 9, then check if the specific round_{number} is undefined. If so, I set the key as an array, and just then I add the elements to it, similarly to the [] from php, but with the function push() from Javascript.

 var tables = []; var left_over_array = [34, 35, 36, 37]; for (var round = 0; round < 10; round++) { if (tables['round_'+round] == undefined) { tables['round_'+round] = []; } tables['round_'+round].push([ left_over_array[0], left_over_array[1], ]); tables['round_'+round].push([ left_over_array[2], left_over_array[3], ]); } console.log(tables['round_0'][0][1]); 

Answer 2

SOLVED

 var tables = []; var left_over_array = [34, 35, 36, 37]; var round = 0; var row = 0; tables['round_'+round] = []; //In JS initialization before assignment is important tables['round_'+round][row+3] = [ left_over_array[0], left_over_array[1], ]; tables['round_'+round][row+10] = [ left_over_array[3], left_over_array[1], ]; console.log(tables['round_0'][3][1]);