Alice and Bob are a married couple who live on the Lower East Side of Manhattan. They are deeply in love, though they fight occasionally.

One winter, Bob dies of an unencrypted website connection, and Alice realizes how much he meant to her, as well as how insignificant their arguments…

Software entities should be open for extension but closed for modification.

Here’s a little principle

That’s readily evincible.

You’ll see a sitch quite oft where

An entity in software

Is certainly extensible

How eminently sensible!

But ‘twould be utter libel

To call it modifiable.

David Mears

This is my programming blog. www.github.com/david-mears

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