alt Hacker NewsPlus, it is simply more enjoyable to design the types in your program than to write unit tests. The fun factor comes from operating on a higher level of abstraction and engages more of your brain’s puzzle-solving mode than just writing unit tests. Making yourself think about “for all x” rather than a concrete x forces your brain to consider deeply the properties of x being used.
> it is simply more enjoyable to design the types in your program than to write unit tests.
I have tried both and I have no idea what you're talking about.
> Making yourself think about “for all x” rather than a concrete x forces your brain to consider deeply the properties of x being used.
The entire point of dynamic typing is that you can think about interfaces rather than concrete types, which entails deep consideration of the properties of the object (semantics of the provided interface).