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Director, Professional Services @RightBrain_Net - 50% engineer, 50% entrepreneur. Former: CTO @Wantify, @agilesoftware, @grasshopper

Eric Polerecky

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“Liskov substitution principle”

The Liskov substitution principle come down to two things:

A base class should not have to know about the classes that derive from it.

A base class should remain in a valid state.