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Pastable version of Code transactions

<pre class='prettyprint' language='ruby'>class Test @@tries=0 attr_reader :num def initialize( num ) @num = num end def do @@tries+=1 puts &quot;Doing #{@num}&quot; @@tries&lt;3 end def undo puts &quot;Undoing #{@num}&quot; end end def transact( objs, actions ) done = [] objs.each { |obj| done.unshift obj if !obj.send actions[0] puts &quot;Unrolling&quot; done.each { |d| d.send actions[1] } break end } end actions = [ :do, :undo ] objs = (1..5).collect { |n| Test.new n } transact( objs, actions )</pre> <a href="http://www.refactormycode.com/codes/452-code-transactions" style="color:#fff" title="As seen on RefactorMyCode.com"><img alt="Small_logo" src="http://www.refactormycode.com/images/small_logo.gif" style="border:0" /></a>