ruby21.md

   1 ---
   2 title: Ruby 2.1
   3 category: Ruby
   4 ---
   5
   6 ### Named arguments with defaults
   7
   8     # length is required
   9     def pad(num, length:, char: "0")
  10       num.to_s.rjust(length, char)
  11     end
  12
  13     pad(42, length: 6)   #=> "000042"
  14     pad(42)              #=> #<ArgumentError: missing keyword: length>
  15
  16 ### Module.prepend
  17
  18     prepend(Module.new do
  19       define_method ...
  20     end)
  21
  22 ### References
  23
  24  * http://globaldev.co.uk/2013/03/ruby-2-0-0-in-detail
  25  * http://globaldev.co.uk/2014/05/ruby-2-1-in-detail