module Enumerable
module Hamster
module Hamster::Associable
module Hamster::EmptyList
module Hamster::Enumerable
module Hamster::Immutable
module Hamster::Immutable::ClassMethods
module Hamster::Immutable::InstanceMethods
module Hamster::Immutable::MemoizeMethods
module Hamster::List
module Hamster::ReadCopyUpdate
module Hamster::Undefined
class Hamster::Cons
class Hamster::Deque
class Hamster::Hash
class Hamster::LazyList
class Hamster::MutableHash
class Hamster::MutableQueue
class Hamster::MutableSet
class Hamster::Partitioned
class Hamster::Partitioner
class Hamster::Realizable
class Hamster::Set
class Hamster::SortedSet
class Hamster::SortedSet::AVLNode
class Hamster::SortedSet::AVLNode::Empty
class Hamster::SortedSet::PlainAVLNode
class Hamster::SortedSet::PlainAVLNode::Empty
class Hamster::Splitter
class Hamster::Splitter::Left
class Hamster::Splitter::Right
class Hamster::Trie
class Hamster::Vector
class IO
class Struct
hamster
3.0.0
# add?
def add?(item) added = false transform do |set| added = !set.include?(item) set.add(item) end added end