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it indicates that the method is destructive,
it makes changes in place to an object rather than to a copy.
It changes the object itself.
the difference in result between the String methods delete and delete!:
der_mensch = "myValue!" # => "myValue!"
der_mensch.delete( "!" ) # => "myValue"
puts der_mensch # => myValue!
der_mensch.delete!( "!" ) # => "myValue"
puts der_mensch # => myValue
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