Ruby Debugging

Stack inspection

• 'where' shows the current call stack
• 'up' moves one frame up the call stack
• 'down' moves one frame down the call stack

• 
  % ruby -rdebug test-rdb
  Debug.rb
  Emacs support available.
  
  test-rdb:4:class WordDictionary
  (rdb:1) where
  --> #1  test-rdb:4
  (rdb:1) n
  test-rdb:29:dictionary = WordDictionary.new
  (rdb:1) s
  test-rdb:6:    return unless FileTest.file?(path)
  (rdb:1) where
  --> #1  test-rdb:6:in `initialize'
  (rdb:1) up
  (rdb:1) up
  At toplevel
  (rdb:1) l 29
  [24, 33] in test-rdb
     24      end
     25      results
     26    end
     27  end
     28   
  => 29  dictionary = WordDictionary.new
     30  p dictionary.findWord("shovel")
  (rdb:1) n
  test-rdb:30:p dictionary.findWord("shovel")
  (rdb:1)