Singleton method not copied : singleton method « Class « Ruby

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Ruby » Class » singleton method   Singleton method not copied s1 = "cat" def s1.upcase   "CaT" end s1_dup   = s1.dup s1_clone = s1.clone s1                    #=> "cat" s1_dup.upcase         #=> "CAT"  (singleton method not copied) s1_clone.upcase       #=> "CaT"  (uses singleton method)   Related examples in the same category 1.  Add singleton method to a string instance 2.  Add a singleton method to a instance object 3.  Use extend to include a module to create single methods

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