Monkey patches the attr_asker method onto Ruby's Class class.

The 'attr_asker' method functions just like attr_reader, only it generates interrogative methods which return the boolean value of the supplied instance variables.

class Example

  attr_asker :alive

  def initialize
    @alive = true
  end

end

example = Example.new

example.alive? # => true

Add this line to your application's Gemfile:

gem 'attr_asker'

And then execute:

$ bundle

Or install it yourself as:

$ gem install attr_asker

Just require attr_asker and then call in in the class definition just as you would attr_reader or attr_writer.

require 'attr_asker'

class Example

  attr_asker :on, :off, :truthy, :falsy

  def initialize
    @on = true
    @off = false
    @truthy = 1
    @falsy = nil
  end

end

example.on? # => true
example.off? # => false
example.truthy? # => true
example.falsy? # => false

Bug reports and pull requests are welcome on GitHub at https://github.com/kitlangton/attr_asker. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

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