length items.This filter does not always consume `self'.
var i = [1,2,3,4,5].iterator
assert i.head(2).to_a == [1,2]
assert i.to_a == [3,4,5]
# Filter: keep only the first `length` items.
#
# This filter does not always consume `self'.
#
# var i = [1,2,3,4,5].iterator
# assert i.head(2).to_a == [1,2]
# assert i.to_a == [3,4,5]
fun head(length: Int): Iterator[E]
do
return new PipeHead[E](self, length)
end
lib/pipeline/pipeline.nit:99,2--109,4