coding style - Correct way of writing parentheses in Ruby methods? -

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What is the "acceptable" or "correct" way of writing brackets in Ruby mode?

Like: 

  puts doc.instance_of? (Self.class.superclass.class)   
 Or:  
  puts the doctor. An example? (Self.class.superclass.class)   
 Or:  
  puts doc.instance_of? (Self.class.superclass.class)   
 Or:  
  puts doc.instance_of? (Self.class.superclass.class)    
 
 
 2 and 3 are incorrect (@MyestoShort See the comment).  
 Between 1 and 4, just pick a style guide and stick with it. Compatibility The most important thing is that I am satisfied with the recommendation of 1 and it looks individually clear:  
  
 Here is an example of 2 breaking with a method Which takes an alternate second argument:  
  def f (x, y = 1) x + y end f (1,2) # 3f (1) # 2f (1, 2 ) # Syntax error f (1), 2 # 3!

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