Combine Collection Operations (ARCH9077)

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Key swift.performance.combine-collection-operations · Severity info · Category performance

Flags filter { }.first / filter { }.count / filter { }.isEmpty / map { }.compactMap chains that have a single-pass equivalent.

Incorrect

users.filter { $0.admin }.first

users.first { $0.admin }

Use first(where:), contains(where:), count(where:), compactMap.