Introduction to Ruby

Transcript

1. Making Ruby Do Things How to force Ruby into submission

   Wednesday, September 19, 12

2. What is Ruby? • Ruby is a dynamic, reflective, general-

   purpose object-oriented programming language... • A dynamic, open source programming language with a focus on simplicity and productivity. Wednesday, September 19, 12

3. class Person def say something puts something end end #

   Create a person object ryan = Person.new # Have Ryan say hello! ryan.say 'Hello there!' Wednesday, September 19, 12

4. Mac Open Terminal.app Window Do a thing? Web http://tryruby.org Want

   to play along? Wednesday, September 19, 12

5. Wednesday, September 19, 12

6. The Basics Wednesday, September 19, 12

7. Rule #1 Everything is an object Wednesday, September 19, 12

8. Basic Data Types and Structures String "Hello World" Integer 100

   Range 1..50 Array [1, 2, 3] Hash { :ruby => 'neat', :javascript => 'rad' } Regexp /\d{3}/ Wednesday, September 19, 12

9. Strings and Integers name = 'Ryan' # Comparing numbers (in

   a hash, by the way) hours[:xbox] = 473 hours[:worked] = 3 hours[:xbox] > hours[:worked] => true Wednesday, September 19, 12

10. Wednesday, September 19, 12

11. Arrays people = [ 'Kirk', 'Andy', 'Jamie' ] people[2] =>

    'Jamie' 0 1 2 Wednesday, September 19, 12

12. Hashes skillz = { ryan: [ 'Ruby on Rails', 'HTML5'

    ], bob: [ 'Illustrator', 'Photoshop' ] } skillz[:ryan][0] => Ruby on Rails Wednesday, September 19, 12

13. Ranges beers = (2..10) beers.each do |count| puts case count

    when 2..3 then "#{count} beers? No problem!" when 4..7 then "Approaching dangerous territory." when 8..10 then "Seriously?? #{count} beers?" end end => 2 beers? No problem! => 3 beers? No problem! => Approaching dangerous territory. => ... Wednesday, September 19, 12

14. Control Structures if condition # do something elsif condition #

    do something else # do something end case myvar when foo then "Hello!" when baz then "Good bye" end while condition # do something end Wednesday, September 19, 12

15. Classes and Methods A little hot object-oriented action Wednesday, September

    19, 12

16. There are all kinds of objects Wednesday, September 19, 12

17. Methods def greet(name) puts "Hello, #{name}!" end Wednesday, September 19,

    12

18. Classes class Human def greet(name) puts "Hello, #{name}!" end end

    Wednesday, September 19, 12

19. Putting it all together class Human def greet(name) puts "Hello,

    #{name}!" end end human = Human.new human.greet('Ryan') Wednesday, September 19, 12

20. Stop. Demo time! cylen.cc/F47w Wednesday, September 19, 12

21. Thanks! • Ryan L. Cross • Twitter: @slant • Github:

    github.com/cylence • The Enclave: enclavecoop.com • ExtendedZombieSlayer2000 cylen.cc/F4vy Wednesday, September 19, 12