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Module: RuboCop::Cop::Duplication

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Included In:
Lint::DuplicateHashKey
Defined in: lib/rubocop/cop/mixin/duplication.rb

Overview

Common functionality for dealing with duplication.

Instance Method Summary

Instance Method Details

#consecutive_duplicates(collection) ⇒ Array (private)

Returns the consecutive duplicates, leaving out the first instance of the duplicated elements.

Parameters:

  • collection (Array) —

    an array to return consecutive duplicates for

Returns:

  • (Array) —

    the consecutive duplicates

[ GitHub ] 

  


# File 'lib/rubocop/cop/mixin/duplication.rb', line 31



def consecutive_duplicates(collection)
  grouped_duplicates(collection).flat_map { |items| items[1..] }
end


  








  

    #duplicates(collection)  ⇒ Array  (private)
  



  

    


Returns all duplicates, including the first instance of the duplicated
elements.



  





  
Parameters:


    
  
  • 
    collection
    (Array)
—    
    

    an array to return duplicates for
    

    
  
    • 



Returns:


    
  
  • 
    (Array)
—    
    

    all the duplicates
    

    
  
    • 





  [ GitHub ]


  

  


# File 'lib/rubocop/cop/mixin/duplication.rb', line 22



def duplicates(collection)
  grouped_duplicates(collection).flatten
end


  








  

    #duplicates?(collection)  ⇒ Boolean  (private)
  



  

    


Whether the collection contains any duplicates.



  





  
Parameters:


    
  
  • 
    collection
    (Array)
—    
    

    an array to check for duplicates
    

    
  
    • 



Returns:


    
  
  • 
    (Boolean)
—    
    

    whether the array contains any duplicates
    

    
  
    • 





  [ GitHub ]


  

  


# File 'lib/rubocop/cop/mixin/duplication.rb', line 13



def duplicates?(collection)
  collection.size > 1 && collection.size > collection.uniq.size
end


  








  

    #grouped_duplicates(collection)  ⇒ Array  (private)
  



  

    


Returns a hash of grouped duplicates. The key will be the first
instance of the element, and  the value an array of the initial
element and all duplicate instances.



  





  
Parameters:


    
  
  • 
    collection
    (Array)
—    
    

    an array to group duplicates for
    

    
  
    • 



Returns:


    
  
  • 
    (Array)
—    
    

    the grouped duplicates
    

    
  
    • 





  [ GitHub ]


  

  


# File 'lib/rubocop/cop/mixin/duplication.rb', line 41



def grouped_duplicates(collection)
  collection.group_by { |item| item }.values.reject(&:one?)
end