Learning about Nill

* The nill object is and object 

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Learning about Nill

* If an undefined method on nil, it will raise a NoMethodError with a message stating that method is not found 

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Learning about Nill

* The nill object has some methods defined i.e. :to_s
 

[#54145891]
Merge pull request #1 from JulianHentea/54145891_about_nil_master

about nil master

[Delivers #54145891]