Function _matrix

helpers/blaze/matrix.ts:17–21

* Recursive function that is able to create a matrix of lists. * The algorithm is quite simple and recursively applies a map. * @example * map(lists[0], (item0) => map(lists[1], (item1) => map(lists[2], (...) => [item0, item1, ...])))

(lists: L.List<L.List<I>>, items: L.List<I> = [])

 * map(lists[0], (item0) => map(lists[1], (item1) => map(lists[2], (...) => [item0, item1, ...])))
 */
function _matrix<I>(lists: L.List<L.List<I>>, items: L.List<I> = []) {
  if (items.length === lists.length) return items

  return map(lists[items.length], (item) => _matrix(lists, [...items, item]))
}

/**
 * Creates the cross-product of a list of lists.