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

The cleanest way I could come up with when stumbling across this myself was the following:

const arrayToMatrix = (array, columns) => Array(Math.ceil(array.length / columns)).fill('').reduce((acc, cur, index) => {
  return [...acc, [...array].splice(index * columns, columns)]
}, [])

where usage would be something like

const things = [
  'item 1', 'item 2',
  'item 1', 'item 2',
  'item 1', 'item 2'
]

const result = arrayToMatrix(things, 2)

where result ends up being

[
  ['item 1', 'item 2'],
  ['item 1', 'item 2'],
  ['item 1', 'item 2']
]