Question

How to declare an empty two dimensional (2D) array in Javascript

Answer 1

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

 

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Answer 2

const rows = 3;
const cols = 2;
 
const arr = [...Array(rows)].map(x=>Array(cols).fill(0));  
 
console.log(arr); 
 
   
   
     
     
/*
run:
     
[[0, 0], [0, 0], [0, 0]]
     
*/

 

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