My problems are about managing state, interactions, triggers, dependencies, responses. High-level problems.
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Swift's seeming lower-tier problems/decisions make waves at higher tiers, see twitter.com/andy_matuschak /cc
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Structs vs. classes in Swift, intuitions:
Monomorphic vs. polymorphic
Stack vs. heap
Value vs. reference
Data vs. identity
Inert vs. active
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That's all possible with Objective-C with thoughtful use of immutable data structures, protocols, and composition.
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