Combine13.swift

let testData = (1...1000000).map { _ in randomString(length: 8) }
func testCombineSwift() {
    _ = Publishers.Sequence(sequence: testData)
        .flatMap { Publishers.Just($0) }
        .map {$0.lowercased()}
        .removeDuplicates()
        .filter({$0.contains("a")})
        .dropFirst(2)
        .sink(receiveValue: { value in
            print(value)
        })
}