Ov

Create a multimethods in Ruby

Installation

Add this line to your application's Gemfile:

gem 'ov'

And then execute:

$ bundle

Or install it yourself as:

$ gem install ov

Usage

Firstly include Ov in you class

class MyClass 
  include Ov 
end

After define method with types:

class MyClass
  include Ov

  #with Fixnum type 
  let :cool_method, Fixnum do |num|
    num * 100
  end 

  #with String type
  let :cool_method, String do |str|
    str << "!"
  end 
end

#And now
my_class = MyClass.new
my_class.cool_method(3)     # => 300
my_class.cool_method("foo") # => foo! 

Class Methods

class MyClass
  self << class
    let :cool_method, Fixnum do |f|
      f + 1
    end
    let :cool_method, String do |s|
      "{s}"
    end
  end
end 


MyClass.cool_method(1)      #=> 2
MyClass.cool_method("test") #=> "test"

Any Type

class MyClass 
  include Ov
  let :cool_method, Any do |any|
    any
  end 
end

my_class = MyClass.new
my_class.cool_method(1)     => 1 
my_class.cool_method("foo") => "foo"

Redefine methods

class A 
  def test(str)
    p "A#test" 
  end
end

class B < A 
  include Ov
  let :test, Fixnum do |num|
    p "only for fixnum"
  end
end 

b = B.new
b.test("asd") # => A#test
b.test(123)   # => only for fixnum

Examples

see link

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request