gcnovus-quacks_like

QuacksLike

QuacksLike is a tiny gem intended to push people towards using duck typing instead of static typing.

Usage

def some_method(an_argument)
  case an_argument
  when quacks_like?(:to_i)                 # responds_to?(:to_i)
    do_something_with an_argument.to_i
  when quacks_like?(:foo, :bar)            # responds_to?(:foo) && responds_to?(:bar)
    an_argument.foo + an_argument.bar
  else
    raise "#{an_argument} can't quack properly; is it duck-like?"
  end
end

Getting it

First, of course, install the gem:

sudo gem install gcnovus-quacks_like

Then add it to either the global namespace:

require 'rubygems'
require 'gcnovus-quacks_like'
QuacksLike.install_everywhere!

or just use it in one class:

require 'rubygems'
require 'gcnovus-quacks_like'

class MyClass
  include QuacksLike
end