CSC/ECE 517 Fall 2011/ch4 4a aj

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Extending objects. : Consider one or more practical examples of Ruby's extend method--that is,
examples that serve a real need and are not contrived.  What facilities do other languages have for extending
objects?  Are they more or less powerful than Ruby's?  Also consider prototype-based languages such as Self, 
which don't even provide classes.
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