Introduction to Ruby

Transcript

1. Making Ruby Do Things
   How to force Ruby into submission
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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.
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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!'
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4. Mac Open Terminal.app
   Window Do a thing?
   Web http://tryruby.org
   Want to play along?
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6. The Basics
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7. Rule #1
   Everything is an object
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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}/
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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
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11. Arrays
    people = [ 'Kirk', 'Andy', 'Jamie' ]
    people[2]
    => 'Jamie'
    0 1 2
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12. Hashes
    skillz = {
    ryan: [ 'Ruby on Rails', 'HTML5' ],
    bob: [ 'Illustrator', 'Photoshop' ]
    }
    skillz[:ryan][0]
    => Ruby on Rails
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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.
    => ...
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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
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15. Classes and Methods
    A little hot object-oriented action
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16. There are all kinds of objects
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17. Methods
    def greet(name)
    puts "Hello, #{name}!"
    end
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18. Classes
    class Human
    def greet(name)
    puts "Hello, #{name}!"
    end
    end
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19. Putting it all together
    class Human
    def greet(name)
    puts "Hello, #{name}!"
    end
    end
    human = Human.new
    human.greet('Ryan')
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20. Stop.
    Demo time!
    cylen.cc/F47w
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21. Thanks!
    • Ryan L. Cross
    • Twitter: @slant
    • Github: github.com/cylence
    • The Enclave: enclavecoop.com
    • ExtendedZombieSlayer2000
    cylen.cc/F4vy
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