Rails Code Club 2 @ Taipei
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The document discusses refactoring code by replacing methods with method objects. Specifically, it talks about extracting the body of a long or complex method into a new class, making the method body smaller and easier to understand. Instance variables can be used to share state between the original method and new method object. The goal is to break apart methods to make the code more readable and maintainable through refactoring.
Rails Code Club 2 @ Taipei
- 1. RAILS CODE CLUB #2 + Rails Tuesday + Rails Bridge 自主練習 + BOARD GAME 19:20 開始
- 2. 上期回顧 • 1 - Intention revealing method • 簡單來說就是註解變成 method • 2 - Special case objects • 從源頭解決 nil 要特殊處理的問題
- 3. 3 - REPLACE METHOD WITH METHOD OBJECT • 主要⺫⽬目的是關進去 refactoring • 開⼀一個新的 class，method body 移過去 • 讀 code，下註解，把註解變成 method • 必須跨 methods 的 local variable 改成 instance variable • 抽出的 method 請放成 private (關起來)
- 4. class OriginMethods def a_fat_method ! ! ! ! end end # $%@ + ($@# / ^%) # && ^ %& * #%%^ # 看不懂的⻤⿁鬼 # and 100 lines...
- 5. class OriginMethods def a_fat_method ! ! ! ! end end class NewMethods def perform end end # $%@ + ($@# / ^%) # && ^ %& * #%%^ # 看不懂的⻤⿁鬼 # and 100 lines...
- 6. class OriginMethods def a_fat_method ! ! ! ! end end class NewMethods def perform ! ! ! ! end end # $%@ + ($@# / ^%) # && ^ %& * #%%^ # 看不懂的⻤⿁鬼 # and 100 lines...
- 7. class OriginMethods def a_fat_method ! ! ! ! end end class NewMethods def perform ! ! ! ! end end # $%@ + ($@# / ^%) # && ^ %& * #%%^ # 看不懂的⻤⿁鬼 # and 100 lines... NewMethods.new.perform
- 8. class NewMethods ! ! ! ! def perform File.open(??????????) # ... end end ! class OriginMethods def a_fat_method(file_name) NewMethods.new.perform end end ?
- 9. class NewMethods ! ! ! ! def perform File.open( ) # ... end end ! class OriginMethods def a_fat_method(file_name) NewMethods.new end end
- 10. class NewMethods ! ! ! ! def perform File.open( ) # ... end end ! class OriginMethods def a_fat_method(file_name) NewMethods.new end end (file_name).perform
- 11. class NewMethods ! ! ! ! def perform File.open( ) # ... end end ! class OriginMethods def a_fat_method(file_name) NewMethods.new end end def initialize(file_name) @file_name = file_name end (file_name).perform
- 12. class NewMethods ! ! ! ! def perform File.open( ) # ... end end ! class OriginMethods def a_fat_method(file_name) NewMethods.new end end @file_name def initialize(file_name) @file_name = file_name end (file_name).perform