= in_enumerable

A simple but nice language extension.

in_enumerable extends the Object type with the tasty 'in?' method, which returns true if an object is included in a list or other enumerable value. So you can do this:

1.in? [1,2] # => true 3.in? [1,2] # => false

instead of the slightly more awkward:

[1,2].include?(1) # => true [1,2].include?(3) # => false

Despite its name, in_enumerable doesn't require an enumerable type.
It uses duck typing to work with any type that has an 'include?' method, such as:

Array (see examples above)

Hash

h = { "a" => 100, "b" => 200 } "a".in?(h) # => true "z".in?(h) # => false

String

"lo".in?("hello") # => true "ol".in?("hello") # => false ?h.in?("hello") # => true

Range

25.in?(1..50) # => true 75.in?(1..50) # => false

Set

require 'set' s = Set.new([1,2]) 1.in?(s) # => true 3.in?(s) # => false

Even Module

module A end class B include A end class C < B end A.in?(B) # => true A.in?(C) # => true A.in?(A) # => false

== Installation

gem install in_enumerable

== Usage

require 'rubygems' require 'in_enumerable'

== Note on Patches/Pull Requests

• Fork the project.
• Make your feature addition or bug fix.
• Add tests for it. This is important so I don't break it in a future version unintentionally.
• Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
• Send me a pull request. Bonus points for topic branches.

== Copyright

Copyright (c) 2009 Brian Morearty. See LICENSE for details.