class Erlang::EmptyList

A list without any elements. This is a singleton, since all empty lists are equivalent.

Licensing

Portions taken and modified from github.com/hamstergem/hamster

Copyright (c) 2009-2014 Simon Harris

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

@private

Public Instance Methods

empty?() click to toggle source
# File lib/erlang/nil.rb, line 57
def empty?
  return true
end
first()
Alias for: head
hash() click to toggle source

@private

# File lib/erlang/nil.rb, line 40
def hash
  return Erlang::EmptyList.hash
end
head() click to toggle source

There is no first item in an empty list, so return `Undefined`. @return [Undefined]

# File lib/erlang/nil.rb, line 46
def head
  return Erlang::Undefined
end
Also aliased as: first
improper?() click to toggle source
# File lib/erlang/nil.rb, line 61
def improper?
  return false
end
length()
Alias for: size
size() click to toggle source

Return the number of items in this `List`. @return [Integer]

# File lib/erlang/nil.rb, line 67
def size
  return 0
end
Also aliased as: length
tail() click to toggle source

There are no subsequent elements, so return an empty list. @return [self]

# File lib/erlang/nil.rb, line 53
def tail
  return self
end