Singl

Have you ever tried to use instance methods on case expressions, and got bored by all the repetition?

tmp_var = my_method.that_gets_an_integer(foo)
case
when tmp_var.odd? then foo_bar(baz)
when tmp_var.zero? then frob(nicate)
else raise Error
end

Say no more to this, using Singl.ify!

Singl.ify! Integer

case my_method.that_gets_an_integer(foo)
when Integer.odd? then foo_bar(baz)
when Integer.zero? then frob(nicate)
else raise Error
end

You can also use it in your own classes:

class Foobar
  ....
  def f
    self.logic
  end

  include Singl
end

baz = Foobar.new
Foobar.f baz

Or, for bonus points, completely ad-hoc:

case my_method.that_gets_an_integer(foo)
when Singl.odd? then foo_bar(baz)
when Singl.zero? then frob(nicate)
else raise Error
end

Singl.f baz

For more info, see the associated blog post

Add this line to your application's Gemfile:

gem 'singl'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install singl

(See above)

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.

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