Ruby substitute for goto -


How can I do something like this in Ruby? 

  if variable = do something then do a do do do elsif variable = something different do do do do do do do do a do c do do da = with set of loops If else b = set if there is a set of loops with loops of some other then d = the last step   
 searching for a way to accomplish something like that in Ruby I'm sure The answer to this question is somewhere, but I do not know what to say. I got some information about a gem which allows you to use goto but I like to learn to do it correctly (I think it might be a joke) I write myself a code I like it, but if my question helps answer, then I can put my actual code.  
 If someone can tell me in the right direction.  
 If Goto is not a joke, then why is not it okay to use it?   
 
 
 A, B and works for it and use them  
 for example For:  
  end of DIF A # code lot   
 You can now only  A  by  getto  A can do.  
 In addition to this instead of using it / if you can use the switch case, so your code looks like  
  A case variable when some BD when BCD and CD end

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