define_methods

DefineMethods

Defines multiple methods with common behavior.

Installation

Add this line to your application's Gemfile:

gem 'define_methods'

And then execute:

$ bundle

Or install it yourself as:

$ gem install define_methods

Usage

Here's a class with similar methods.

class Greet
  def hi(greeted)
    "Hi #{greeted}!"
  end

  def hello(greeted)
    "Hello #{greeted}!"
  end

  def goodbye(greeted)
    "Goodbye #{greeted}!"
  end
end

greet = Greet.new
greet.hello('world') # => "Hello world!"
greet.goodbye('world') # => "Goodbye world!"

DefineMethods#define_methods

Defines methods just like Module#define_method. However it accepts a list of method names as arguments. To use it, just extend the class like so.

class Greet
  extend DefineMethods

  define_methods(:hi, :hello, :goodbye) do |greeted|
    "#{__method__.capitalize} #{greeted}!"
  end
end

DefineMethods::call

Accepts the same arguments as define_methods. It returns a Module with the defined methods. Here's the equivalent class, but with one less line of code.

class Greet
  include DefineMethods.(:hi, :hello, :goodbye) do |greeted|
    "#{__method__.capitalize} #{greeted}!"
  end
end

DefineMethods::each

Accepts just the method definition block. It returns a class holding the same method definition for building modules later. Use this to share the same behavior across many classes.

Exclaiming = DefineMethods.each do |subject|
  "#{__method__.capitalize} #{subject}!"
end

Greet.include Exclaiming[:hi, :hello, :goodbye]
Command.include Exclaiming[:stop, :go, :turn]

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/richorelse/define_methods.

License

The gem is available as open source under the terms of the MIT License.