Jetbrain refactor

• cmd opt m => 程式碼抽出來變function
• inline
• expression

useful key map

• cmd [ => go back to previous location
• cmd ] => go to next previous location
• gd => go to definition(with ideavim setting)

mac Hotkey

• ctrl n => 方向鍵下
• ctrl p => 方向鍵上
• ctrl f => 方向鍵左
• ctrl b => 方向鍵右
• ctrl a => 到游標最前面
• ctrl e => 到游標最後面