lect13b
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quick review of rng.ss closures; show the last case. http://www.radford.edu/~itec380/2009spring-ibarland/Lectures/lect10-java-closures/ButtonHolder.java OO vs procedural: An organizational difference: rows vs columns in the table of variants vs. methods.
When adding new variants to Expr which one reminds you to update the new methods? (What's the dual point to this complaint? Is it as important?)
(Remember that inheritance (and its associated polymorphism) is the key non-syntactic-sugar difference between the two.)

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lect13b ...

lect13b
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