Class: Immutable::List

Inherits:

Object

• Object
• Immutable::List

show all

Includes:

Consable

Defined in:

lib/immutable/list.rb

Overview

include Immutable
p List[]      #=> List[]
p List[1, 2]  #=> List[1, 2]

p Nil                    #=> List[]
p Cons[1, Cons[2, Nil]]  #=> List[1, 2]

Class Method Summary (collapse)

• + (list) empty

  Returns an empty list.

Instance Method Summary (collapse)

• - (List) cons(x)

  Adds a new element at the head of self.

• - (true, false) empty?

  Returns whether self is empty.

• - (Object) head

  Returns the first element of self.

• - (List) init

  Returns all the elements of self except the last one.

• - (Object) last

  Returns the last element of self.

• - (List) pop

  Same as #init.

• - (List) tail

  Returns the elements after the head of self.

• - (List) to_list

  Returns self.

Methods included from Consable

#+, #drop, #drop_while, #filter, #flat_map, #flatten, included, #intercalate, #intersperse, #map, #prepend, #rev_map, #reverse, #subsequences, #take, #take_while, #transpose, #unshift, #zip, #zip_with

Methods included from Headable

#==, #[], #each, #each_index, #eql?, #fetch, #find, #first, #foldl, #foldl1, #foldr, #foldr1, #hash, #index, #inspect, #null?, #rindex, #shift

Methods included from Foldable

#foldl, #length, #product, #sum

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# File 'lib/immutable/list.rb', line 26

def self.empty
  Nil
end

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# File 'lib/immutable/list.rb', line 34

def cons(x)
  Cons[x, self]
end

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# File 'lib/immutable/list.rb', line 81

def empty?
  # this method should be overriden
end

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# File 'lib/immutable/list.rb', line 42

def head
  # this method should be overriden
end

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# File 'lib/immutable/list.rb', line 67

def init
  # this method should be overriden
end

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# File 'lib/immutable/list.rb', line 50

def last
  # this method should be overriden
end

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# File 'lib/immutable/list.rb', line 74

def pop
  init
end

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# File 'lib/immutable/list.rb', line 58

def tail
  # this method should be overriden
end

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# File 'lib/immutable/list.rb', line 88

def to_list
  self
end