Foundation Collection Bridging (ARCH9087)
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Key swift.performance.foundation-collection-bridging · Severity info · Category performance
Flags NSMutableArray / NSMutableDictionary / NSArray / NSDictionary used in Swift code - every access bridges and boxes.
Incorrect
Section titled “Incorrect”let items = NSMutableArray()Correct
Section titled “Correct”var items: [Item] = []Use Swift Array / Dictionary / Set.