Why?

Rails, Rake, Ceedling, brew, ...

基本語法

Koans: http://rubykoans.com/

• array

  Array.new(3)
  # [nil, nil, nil]
  Array.new()
  # []
  []
  # []
  array.each / each_index
  

• hash

  {a: 123}
  {"a" => 123}
  {:123 => 123}
  

• 繼承、