Question

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

Answer 1

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

 

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Answer 2

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

 

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Answer 3

const rows:number = 3;
const cols:number = 4;
const arr: number[][] = 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]] 
 
*/

 

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