Question

How to create fixed size empty matrix JavaScript

Answer 1

function Print(arr2d, rows, cols) {
    for (let i = 0; i < rows; i++) {
        let s = "";
        for (let j = 0; j < cols; j++) {
            s +=  arr2d[i][j] + " ";
        }
        console.log(s);
    }
    console.log();
}
 
const rows = 4;
let matrix = new Array(rows);
 
const cols = 3;
for (let i = 0; i < rows; i++) {
    matrix[i] = new Array(cols);
}
 
Print(matrix, rows, cols);
 
 
  
/*
run:
    
undefined undefined undefined 
undefined undefined undefined 
undefined undefined undefined 
undefined undefined undefined 
      
*/

 

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Answer 2

function Print(arr2d, rows, cols) {
    for (let i = 0; i < rows; i++) {
        let s = "";
        for (let j = 0; j < cols; j++) {
            s +=  arr2d[i][j] + " ";
        }
        console.log(s);
    }
    console.log();
}
 
const rows = 4;
const cols = 3;
 
let matrix = [];
 
for (let i = 0; i < rows; i++) {
    matrix[i] = new Array(cols);
}
 
Print(matrix, rows, cols);
 
 
  
/*
run:
    
undefined undefined undefined 
undefined undefined undefined 
undefined undefined undefined 
undefined undefined undefined 
      
*/

 

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Answer 3

function Print(arr2d, rows, cols) {
    for (let i = 0; i < rows; i++) {
        let s = "";
        for (let j = 0; j < cols; j++) {
            s +=  arr2d[i][j] + " ";
        }
        console.log(s);
    }
    console.log();
}
 
const rows = 4;
const cols = 5;
 
const matrix = Array(rows).fill(0).map(() => Array(cols).fill(0));
 
Print(matrix, rows, cols);
 
 
  
/*
run:
    
0 0 0 0 0 
0 0 0 0 0 
0 0 0 0 0 
0 0 0 0 0 
      
*/

 

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