Question

How to get the rows and columns of a matrix (2D array) in JavaScript

Answer 1

const arr = [
  [1, 2, 3, 5, 6],
  [4, 5, 6, 5, 6],
  [7, 8, 9, 5, 6]
];

const rows = arr.length;
const cols = arr[0].length;

console.log(rows); 
console.log(cols); 

  
    
    
/*
run:
    
3
5
    
*/

 

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