Ruby 1.8 -> 1.9 Forwards Compatibility

_README.md

Forward Compatibility with Ruby 1.9

These gists are to support this blog post.

HashesAreOrdered.rb

# Ruby 1.8
p({:a => '123', :b => '234'})
#=> {:b=>"234", :a=>"123"}

# Ruby 1.9
p({:a => '123', :b => '234'})
#=> {:a=>"123", :b=>"234"}

ObjectSuperclass.rb

# Ruby 1.8
p Object.superclass
#=> nil
 
# Ruby 1.9
p Object.superclass
#=> BasicObject

PrivateBlockParams.rb

# Ruby 1.8
a = 0
%w{all your base}.each{|a| puts a}
puts "a = #{a}"
#=> all
#=> your
#=> base
#=> a = base
 
# Ruby 1.9
a = 0
%w{all your base}.each{|a| puts a}
puts "a = #{a}"
#=> all
#=> your
#=> base
#=> a = 0

RetryOnLoops.rb

# Ruby 1.8
%w{a b c}.each do |w| 
  p w
  a += 1
  retry unless a > 5
end
#=> "a"
#=> "a"
#=> "a"
#=> "a"
#=> "a"
#=> "b"
#=> "c"
 
# Ruby 1.9
%w{a b c}.each do |w| 
  p w
  a += 1
  retry unless a > 5 # BOOM!
end

SingleLineStatements.rb

# Ruby 1.8
if a > 0 then a = 0 #okay
if a > 0 : a = 0    #okay
 
# Ruby 1.9
if a > 0 then a = 0 #okay
if a > 0 : a = 0    #not okay