If a method name ends in an exclamation point (!), as in delete! : Reserved words « Language Basics « Ruby






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If a method name ends in an exclamation point (!), as in delete!


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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