3. ABOUT RUBY
• Created by Matz - he’s from Japan!
• Written for humans not for computers
• Easy to read and write
• 5.times { puts “Arigato Matz! Have some chunky bacon!”}
• [‘riverside’, ‘japan’, ‘america’].each { |locale| puts
locale.capitalize }
• Popularized by Ruby on Rails
Monday, September 27, 2010
4. INSTALLATION
• Mac Users, I say rejoice, for thou haveth Ruby already!
• Windows users - are you prejudiced towards Japan or
something?! Let’s fix that by installing Ruby:
• http://rubyinstaller.org/
- follow the default installation steps
and you are good to go. It will install to your programs
directory.
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5. IRB IS THE WORD
• irb - Interactive Ruby Console.
The best way to tryout and learn
Ruby.
• Comes packaged with your Ruby
Install
• To Use:
• Mac: open up command line and
type: irb
• Windows: open up Interactive
Ruby program
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6. IRB EXAMPLES
3.times { puts "da" }
["paris", "france", "napoleon"].each { |name| puts
name.capitalize }
def say_hi_to(name)
puts "Please to meet you, #{name}!"
end
say_hi_to("Mr. President")
cost = 100
tax = 8.25
total = cost + tax
puts total
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7. EVERYTHING IS AN OBJECT
1.class # => Fixnum
'a'.class # => String
:z.class # => Symbol
class Foo
# something here
end
Foo.class # => Class
Foo.new.class # => Foo
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8. DYNAMICALLY TYPED
Basically, this means you don’t have to define things as
integer or string before runtime.
def foo(bar)
bar * 2
end
foo(1) # => 2
foo("a") # => "aa"
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9. DUCK TYPING
If it looks like a duck, walks, like a duck, and quacks like a
duck, then it’s probably a duck.
"a".respond_to? :size # => true
1.respond_to? :+ # => true
1.respond_to? :inject # => false
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11. MORE EXAMPLES OF RUBY
Hashes
options = {:name => "Riverside", :state => "CA"}
Iterators
[1,2,3].each {|n| puts n} # => 1 2 3
If/Elses
if something == 2
# do something
elsif something == 1
# do something
else
# do somthing else
end
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12. ENTER SINATRA
• Sinatra is a web framework built on top of Ruby. It’s kinda like
Rails, but much lighter. You use it to build websites with Ruby.
• [sudo] gem install sinatra
• Gems are just a cool word for ‘libraries’ in the Ruby world.
They contain packaged up code that do cool things. Rails is a
gem, Sinatra is a gem, and nokogiri is a gem. You can find gems
at http://rubygems.org
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13. PUT THIS IN YOUR PIPE
Monday, September 27, 2010
