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

Short answer use:

const gridArray=(a,b)=>{const d=[];return a.forEach((e,f)=>{const 
h=Math.floor(f/b);d[h]=d[h]||[],d[h][f%b]=a[f]}),d};

Where:

a: is the array
b: is the number of columns

Long answer you can read the article:

How to convert an array of length ‘n’ to array grid