Property Wrappers or How Swift decided to become Java
summary
Swift 5.1 property wrappers let code attach compile‑time synthesized behavior to properties and even functions: examples include a clamping wrapper that enforces numeric ranges (initial value checked in init), a user defaults wrapper that removes boilerplate by mapping keys and defaults, and a cached function wrapper that gives a dictionary memoization yielding microsecond vs millisecond speedups. Projected values are exposed with $var, wrapper init uses an initialValue convention, and a proof‑of‑concept GET‑service wrapper works but composition and self‑mutation remain limitations.
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chapters (10)
- 0:00Intro
- 1:37Kotlin & Java Annotations
- 4:30Clamping Numerical Values
- 7:32Compiler Magic
- 9:41Data Versioning
- 13:43User Defaults
- 14:57Functional Programing in Swift
- 18:54Caching Pure Functions
- 20:12Property Wrappers & Functions
- 26:23Recap
