Ruby Bang Methods & precautions

Ruby Bang Methods:

Methods which have ! sign at the end are called bang methods.

Standard Ruby bang methods often return nil if no change was needed.

 str = 'FOOBAR'
 p str.upcase! #bang mehtod -> return nil 
 p str.upcase # still return upcased string without any change
 p str

arr = [1, 3, 7]
  p arr.uniq! #bang mehtod -> return nil 
  p arr


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