How to drive code by sketching it

Actually, there are numerous of ways to sketch software or pieces of it. Drawing with a pen on a paper or on a white-board, using an UML tool et cetera. The goal is just to get things simplified and get an abstract view of it to find the core issues. With the introduction of Test-driven Development (TDD) a new way appeared end of the 90ties. TDD is controversially discussed and I don’t want to dig into the pros and cons of this approach. Rather I’d like to pick up one aspect of this methodology: drive code and design by coding.
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