The matching elements have the same order in the returned iterable as they have in iterator.
This method returns a view of the mapped elements. As long as the returned Iterable is not iterated over, the supplied function test will not be invoked. Iterating will not cache results, and thus iterating multiple times over the returned Iterable may invoke the supplied function test multiple times on the same element.
Iterable<E> where(bool f(E element)) => new WhereIterable<E>(this, f);