Return first element that passes the mapping

Collection+FirstMap.swift

extension Collection {
    public func firstMap<T>(where predicate: (Element) throws -> T?) rethrows -> T? {
        for element in self {
            if let value = try predicate(element) {
                return value
            }
        }
        return nil
    }
}

let collection = ["A", "B", "1", "C"]


let first = collection.firstMap { str in
    Int(str)
}

print(first)