partition method Null safety

Tuple2<Iterable<E>, Iterable<E>> partition(
  1. Predicate<E> test
)

Splits this collection into pair (Tuple2) of lazy iterables, where item1 contains elements for which test yields true, while item2 contains elements for which test yields false.

Example:

[1, 0, -3, 4, -6].partition((n) => n.isNegative) // => ([-3, -6], [1, 0, 4])

Implementation

Tuple2<Iterable<E>, Iterable<E>> partition(Predicate<E> test) {
  final itrPositive = this?.where(test) ?? Iterable.empty();
  final itrNegative = whereNot(test);
  return Tuple2(itrPositive, itrNegative);
}