Swift 3.1 has solved this problem with drop(while:) and prefix(while:)

struct Person {
    let isMale: Bool
    let name: String
}

let people = [Person(isMale: true, name: "Bill"),
              Person(isMale: false, name: "Jane"),
              Person(isMale: true, name: "José"),
              Person(isMale: false, name: "Sarah"),
              Person(isMale: true, name: "Steve"),
              Person(isMale: true, name: "Tony")]

func trimMen(people: [Person]) -> [Person] {
    let removedPrefixMen = people.drop { $0.isMale }
    let removedSuffixMen = removedPrefixMen.reversed().drop { $0.isMale }
    return removedSuffixMen.reversed()
}

// [{isMale false, name "Jane"}, {isMale true, name "José"}, {isMale false, name "Sarah"}]

Swift 3.1 has solved this problem with drop(while:) and prefix(while:)

struct Person {
    let isMale: Bool
    let name: String
}

let people = [Person(isMale: true, name: "Bill"),
              Person(isMale: false, name: "Jane"),
              Person(isMale: true, name: "José"),
              Person(isMale: false, name: "Sarah"),
              Person(isMale: true, name: "Steve"),
              Person(isMale: true, name: "Tony")]

func trimMen(people: [Person]) -> [Person] {
    let removedPrefixMen = people.drop { $0.isMale }
    let removedSuffixMen = removedPrefixMen.reversed().drop { $0.isMale }
    return removedSuffixMen.reversed()
}

// [{isMale false, name "Jane"}, {isMale true, name "José"}, {isMale false, name "Sarah"}]

Also in Swift 3.1, concrete constrained extensions, means I can do this…

extension Array where Element == Person {
    
    func trimMen() -> [Element] {
        let removedPrefixMen = drop{ $0.isMale }
        let removedSuffixMen = removedPrefixMen.reversed().drop{ $0.isMale }
        return removedSuffixMen.reversed()
    }
}

people.trimMen()