generateBook method
Implementation
Map<int, List<E>> generateBook({int? valuesPerPage, int? numberOfPages}) {
if (valuesPerPage == null && numberOfPages == null) return {0: this as List<E>};
valuesPerPage ??= length ~/ numberOfPages!;
var book = <int, List<E>>{};
int pageCount = 0;
var list = this;
while (list.isNotEmpty && (numberOfPages == null || pageCount < numberOfPages)) {
book[pageCount++] = take(valuesPerPage).toList();
list = list.skip(valuesPerPage);
}
return book;
}