Ruby 1.9 changes Quick Reference

ruby1.9.rb

# some nice ruby 1.9 additions

str = arr.map(&:firstname)  # if arr is an array of user object (worked in ruby 1.8 with activesupport but now native in ruby 1.9)

# map, each, etc... returns an iterator object with a with_index method
arr.map.with_index {|element, i| ... }
arr.each.with_index {|element, i| ... }

# lambda can have default parameters
p = proc{|a, b = 3| ... }


# each string has an internal encoding now (utf8 is default ?)
str = "something"
str.encoding => #<Encoding:UTF-8>
str.encode('ascii') => "something"

str = "téléphone"
str.encode('ascii') => Encoding::UndefinedConversionError: "\xC3\xA9" from UTF-8 to US-ASCII
str.encode("ascii", :invalid => :replace, :undef => :replace) => "t?l?phone"