mlomnicki

def foo(a = "hello", b = "stranger")
  puts "#{a} #{b}"
end

foo("go" "away")

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# << operator
original = "foo"
copy = original

copy << "bar"
copy # => "foobar"
original # => "foobar"

# += operator
original = "foo"

mlomnicki

# How to check how many arguments the method accepts?

class Foo 

  def initialize
    
  end 

  def bar(a,b)
    

mlomnicki

# Check if class inherits from antoher class

if Fixnum < Numeric
  puts "Fixnum is a numeric"
else
  puts "Fixnum is not a numeric"
end

mlomnicki

require 'yaml'

puts "Want some magic?"

y = YAML::load(DATA)

puts y.inspect
__END__

---

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a, *b = [1,2,3,4]
# a = 1
# b = [2,3,4]

mlomnicki

class String

   def to_proc
      eval "Proc.new { |*args| args.first#{self} }"
   end

end

[1,2,3].collect(&'+5')

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puts "Before block comment"
=begin
   The method above prints a string to stdout
   Pretty awesome!
   And the method below does the same!
=end
puts "After block comment"

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s = 'michal@example.com'
s[/^([^@]+)@(.*)/, 1] # => michal
s[/^([^@]+)@(.*)/, 2] # => example.com

s.match(/^([^@]+)@(.*)/)[1] # => michal
s.match(/^([^@]+)@(.*)/)[2] # => example.com

mlomnicki

module Utils

   def foo
      puts "bar"
   end

   def bar
      puts "foo"
   end