Ruby Method of the Month 2009.08. Lightning talk for the Columbus Ruby Brigade.

1. THE METHODS METHOD
AND ITS FRIENDS
Method of the Month - Kevin Munc - @muncman

2. Class.methods.grep(/method/)
=> ["private_class_method", "method", "public_methods",
"public_instance_methods", "method_defined?", "methods",
"protected_instance_methods", "public_method_defined?",
"singleton_methods", "private_instance_methods",
"private_method_defined?", "protected_methods",
"instance_method", "protected_method_defined?",
"public_class_method", "instance_methods", "private_methods"]

3. o = Object.new
=> #<Object:0x39cd94>
o.methods.grep(/method/)
=> ["method", "public_methods", "methods",
"singleton_methods", "protected_methods",
"private_methods"]

4. o.methods.grep(/method/).sort
=> ["method", "methods", "private_methods",
"protected_methods", "public_methods",
"singleton_methods"]

5. Method Methods
Object#method
Object#methods
Object#public_methods
Object#protected_methods
Object#private_methods
Object#singleton_methods

6. class Motm < String
def first_method
puts ‘First!’
end
def second_method
puts ‘Second!’
end
end

7. #methods &
#public_methods
motm = Motm.new
=> ""
motm.public_methods(false)
=> ["first_method", "second_method"]

8. #methods &
#public_methods
(motm.methods - "".methods).length
=> 2

9. Question for the Experts
# Why this difference?!?
motm.public_methods(true).length == motm.methods(true).length
=> true
# but...
motm.public_methods(false).length == motm.methods(false).length
=> false (2 vs. 0)

10. #protected_methods
class Motm
def protect_this
puts 'Protected!'
end
protected :protect_this
end

11. #protected_methods
motm = Motm.new
=> ""
motm.protected_methods(false)
=> ["protect_this"]

12. #private_methods
class Motm
def my_privates
puts 'Private!'
end
private :my_privates
end
motm.private_methods(false)
=> ["my_privates"]

13. #singleton_methods
1. 2.
3. 4.

14. #singleton_methods
1. module Crb 2.
def brigade
puts ‘This’
end
end 3. 4.

15. #singleton_methods
1. module Crb 2. class Motm
def brigade def self.short
puts ‘This’ puts ‘is’
end end
end 3. end 4.

16. #singleton_methods
1. module Crb 2. class Motm
def brigade def self.short
puts ‘This’ puts ‘is’
end end
end 3. motm = Motm.new end 4.
def motm.part_one
puts ‘Spinal’
end

17. #singleton_methods
1. module Crb 2. class Motm
def brigade def self.short
puts ‘This’ puts ‘is’
end end
end 3. motm = Motm.new end 4. class << motm
def motm.part_one include Crb
puts ‘Spinal’ def part_two
end puts ‘Tap’
end
end

18. #singleton_methods
Motm.singleton_methods(false)
=> ["short"]
motm.singleton_methods
=> ["part_two", "brigade", "part_one"]
motm.singleton_methods(false)
=> ["part_two", "part_one"]

19. #singleton_methods
motm2 = Motm.new
=> #<Motm:0x578ce4>
motm2.singleton_methods
=> []

20. #method
meth = motm.method(:protect_this)
=> #<Method: MyClass#protect_this>
meth.call
Protected!
=> nil

21. QUESTIONS? ANSWERS?
Photo Sources
http://www.library.usyd.edu.au/libraries/rare/medicine/barrough.html
http://www.dnrmusicstore.com/graphics/HL%20guitar.JPG
http://img1.jurko.net/wall/paper/method_man_2.jpg