This page contains automated test results for code from O'Reilly's Ruby Cookbook. If this code looks interesting or useful, you might want to buy the whole book.

Making a Hash More Like a Struct
CodeExpectedActual
require 'rubygems'
require 'facet/hash/to_ostruct'
cliches = { 'hammer' => 'tongs', :lock => ['stock', 'barrel'] }
cliches_struct = cliches.to_ostruct
cliches_struct.hammer
 "tongs" "tongs" 
cliches_struct.lock
 ["stock", "barrel"] ["stock", "barrel"] 
cliches_struct.rolling_stone
 nil nil 
class StructlikeHash < Hash
  def method_missing(name, *args)
    if include?(name)
      self[name]
    elsif include?(name.to_s)
      self[name.to_s]
    else
      super
    end
  end
end
cliches = StructlikeHash['cat' => 'mouse', 'grin' => { 'bear' => 'it' } ]
cliches.cat
 "mouse" "mouse" 
cliches.creek                      
NoMethodError: undefined method `creek' for {"cat"=>"mouse", "grin"=>{"bear"=>"it"}}:StructlikeHash
...
 
NoMethodError: undefined method `creek' for {"cat"=>"mouse", "grin"=>{"bear"=>"it"}}:StructlikeHash
	from (irb):15:in `method_missing'
	from (irb):21

class StructlikeHash2 < Hash
  def method_missing(name, *args)
    if include?(name)
      self[name]
    elsif include?(name.to_s)
      self[name.to_s]
    else
      begin
        super
      rescue NoMethodError 
        nil
      end
    end
  end
end
cliches = StructlikeHash2['cat' => 'mouse', 'grin' => { 'bear' => 'it' } ]
cliches.creek
 nil nil 
cliches[:keys] = 'to the kingdom'
cliches[1] = 'and only'
cliches[:top] = 'of the world'
cliches["top"] = 'to bottom'
cliches.keys
 ["cat", :top, 1, "grin", "top", :keys] ["cat", :top, 1, "grin", "top", :keys] 
cliches.top
 "of the world" "of the world" 
cliches.1                              
SyntaxError: compile error
...
 
SyntaxError: compile error
(irb):45: no .<digit> floating literal anymore; put 0 before dot
cliches.1
        ^
(irb):45: parse error, unexpected tINTEGER
cliches.1
         ^
	from (irb):45