Wednesday, March 13, 2019

Exhaustive Swift Properties With Tuples

Joshua Emmons:

How can we get switch-like exhaustiveness when dealing with the properties of a type? The first step (and our first clue) is to treat the properties as a set. What if we put them in a tuple?


So, to be clear, habitually shoving all properties into a tuple won’t scale well. But it is a useful tactic to employ when dealing with models, mocks or anything that has:

  1. naturally constrained state,
  2. logic that depends on the shape of said state, and
  3. a strong affinity towards change in the face of shifting requirements

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