The underestimated power of KeyPaths
summary
Swift 4 KeyPaths become actionable tools: a tiny prefix operator ^ operator converts a KeyPath into a getter so map and similar APIs accept backslash syntax; a small combinator on(keyPath: , by:) builds comparators from a KeyPath plus an optional comparator (defaults to <) so sorted yields concise, type‑safe ordering; a predicate builder produces NS‑predicate‑like filters; examples compile and run, reducing boilerplate while keeping type safety.
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