Chunk Array

chunk.js

const arr = [1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4]

const division = ( a, b ) => Math.ceil( a / b )

const sliceArray = size => acc => {
  acc[1].push( acc[0].splice( 0, size ) );
  return acc
};

const chunk = ( arr, size = 2 ) =>
  Array( division( arr.length, size ) )
    .fill()
    .reduce( sliceArray( size ), [[].concat(arr), []])[1]

Array.from({ length: 10 }, ( _, i ) => chunk( arr, i + 1 ) )
chunk([...Array(200).keys()], 10)