Sending a message by name

equivalent:

cookie.bake cookie.send(:bake) method_name = "bake" cookie.send(method_name) ```

Duping and freezing and cloning

• dup makes a copy of the object's data, so you can change it without affecting the original
• freeze makes it so when you try to modify an object, it raises an exception instead
• clone is like dup, but cloning a frozen object freezes the new clone too
  • also clone copies the singleton methods

>> cookie.methods(false)
=> [:bake, :yell]
>> cookie.clone.methods(false)
=> [:bake, :yell]
>> cookie.dup.methods(false)
=> []

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