How to convert simple array into two-dimensional array (matrix) with Javascript

Question

Imagine I have an array:

A = Array(1, 2, 3, 4, 5, 6, 7, 8, 9);

And I want it to convert into 2-dimensional array (matrix of N x M), for ins

Answer 1

Simplest way with ES6 using Array.from()

const matrixify = (arr, size) => 
Array.from({ length: Math.ceil(arr.length / size) }, (v, i) =>  
arr.slice(i * size, i * size + size));
const list =  [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12] ;
console.log(matrixify(list, 3));