Question

How to create a two dimensional (2D) array dynamically in JavaScript

Answer 1

let val = 1;
const arr = [];

for (let i = 0;i < 2; i++) {
  const row = [];
  for (let j = 0;j < 5; j++) {
    row.push(val);
    val++;
  }
  arr.push(row);

}

console.log(arr);

   
   
   
/*
run:
   
[ [ 1, 2, 3, 4, 5 ], [ 6, 7, 8, 9, 10 ] ]

*/

 

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Answer 2

let val = 1;
const arr = [];

for (let i = 0;i < 2; i++) {
  const row = [];
  for (let j = 0;j < 5; j++) {
    row.push("val" + val);
    val++;
  }
  arr.push(row);

}

console.log(arr);

   
   
   
/*
run:
   
[
  [ 'val1', 'val2', 'val3', 'val4', 'val5' ],
  [ 'val6', 'val7', 'val8', 'val9', 'val10' ]
]

*/

 

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