Question

How to create a two dimensional (2D) array in Node.js

Answer 1

const rows = 3;
const cols = 2;
 
let arr = new Array(rows); 
 
for (var i = 0; i < rows; i++) {
    arr[i] = new Array(cols);
}
 
console.log(arr); 
 
   
   
     
     
/*
run:
     
[ [ <2 empty items> ], [ <2 empty items> ], [ <2 empty items> ] ]
     
*/

 

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Answer 2

const rows = 3;
const cols = 2;
 
let arr = Array.from(Array(rows), () => new Array(cols));
 
console.log(arr); 
 
   
   
     
     
/*
run:
     
[ [ <2 empty items> ], [ <2 empty items> ], [ <2 empty items> ] ]
     
*/

 

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Answer 3

const rows = 3;
const cols = 2;
 
let arr = Array(rows).fill().map(() => Array(cols));
 
console.log(arr); 
 
   
   
     
     
/*
run:
     
[ [ <2 empty items> ], [ <2 empty items> ], [ <2 empty items> ] ]
     
*/

 

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Answer 4

const rows = 4;
const cols = 5;
const arr = new Array(rows).fill(new Array(cols).fill(0));
  
console.log(arr);
  
  
  
  
/*
run:
  
[
  [ 0, 0, 0, 0, 0 ],
  [ 0, 0, 0, 0, 0 ],
  [ 0, 0, 0, 0, 0 ],
  [ 0, 0, 0, 0, 0 ]
]
 
*/

 

70+ SQL courses for beginners and professionals