Returns a new lazy Iterable with all elements that satisfy the
predicate test.
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.
Source
Iterable<E> where(bool test(E element)) => new WhereIterable<E>(this, test);