Ruby Debugging

Inspect variables at breakpoint and step through code

• 'p <expr>' lets you peek at variables or method call results
• 'v l' lists all variables in the current scope
• 'm <class>' lists the methods of a class
• 's' steps through current line of code, following any method calls and stepping through them as well
• 'n' executes the current line, but doesn't step through any calls made on that line

• (rdb:1) p wordFragment
  "shovel"
  (rdb:1) n
  test-rdb:20:    puts "dictionary size is #{@dict.size}"
  (rdb:1) n
  dictionary size is 235880
  test-rdb:21:    results = []
  (rdb:1) n
  test-rdb:22:    @sortedDictKeys.each do |key|
  (rdb:1) v l
    results => []
    wordFragment => "shovel"
  (rdb:1) m WordDictionary
  findWord 
  (rdb:1) n
  test-rdb:23:      results << key if key =~ /#{wordFragment}/
  (rdb:1) p key
  "A"
  (rdb:1) finish
  ["reshovel", "shovel", "shovelard", "shovelbill", "shovelboard",
   "shovelfish", "shovelful", "shovelhead", "shovelmaker", "shovelman",
   "shovelnose", "shovelweed", "unshoveled"]
  

• % ruby -rdebug test-rdb
  Debug.rb
  Emacs support available.
  
  test-rdb:4:class WordDictionary
  (rdb:1) n
  test-rdb:29:dictionary = WordDictionary.new
  (rdb:1) n
  test-rdb:30:p dictionary.findWord("shovel")
  (rdb:1) s
  test-rdb:19:    return if wordFragment.empty?