Izzy

Monkey patch to object to make for a nicer time of conditionals! Just install the gem and you're ready to go!

Let's take our class, Person:

class Person
  include Izzy # Make sure to include Izzy!
  attr_reader :name, :age, :sex

  def initialize(name, age, sex)
    @name = name
    @age  = age
    @sex  = sex
  end

  def older_than_18?
    @age > 18
  end

  def younger_than_18?
    @age < 18
  end

  def male?
    @sex == 'm'
  end

  def female?
    @sex == 'f'
  end

  def me?
    @name == 'brandon' && @sex == 'm'
  end

  def geek?
    @name == 'brandon'
  end
end

So we make our person:

brandon = Person.new('brandon', 23, 'm')

...and do some comparisons!

brandon.all_of?  :older_than_18, :male, :me, :geek # => true
brandon.none_of? :younger_than_18, :female         # => true
brandon.any_of?  :male, :female, :geek             # => true

Maybe boolean comparisons aren't your cup of tea. Izzy has you covered my friend:

brandon.matches_all?  name: /^br/, age: (20..30) # => true
brandon.matches_any?  name: /br$/, age: (20..30) # => true
brandon.matches_none? name: /br&/, age: (30..40) # => true

Izzy compares on === much like a case statement, allowing you to regex and range away! You can even do type checks while you're at it.

brandon.matches_all? name: String, age: Integer

Why stop there? Need a bit more power? We have Lambdas for that!

brandon.matches_all? name: -> n { n.length > 3 }, age: -> a { a.odd? } # => true

....or let's push it further for some interesting results:

brandon.matches_all?(
  name: [
    /br/, /an/, -> n { n.length > 5 }
  ],
  age: [
    (20..30), -> a { a > 20 }
  ]
)

# => true

Simple to the point, no more mess of && or || checks for the same object. All you have to do is include Izzy in your object and you're ready to go!

Installation

Add this line to your application's Gemfile:

gem 'izzy'

And then execute:

$ bundle

Or install it yourself as:

$ gem install izzy

Usage

It patches object, just use it with any method that matches the pattern is_foo? and you're good to go!

Contributing

1. Fork it ( http://github.com/baweaver/izzy/fork )
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