How to make async / await in Swift?

Question

I would like to simulate async and await request from Javascript to Swift 4. I searched a lot on how to do it, and I thought I found the answer with DispatchQueue

Answer 1

You can use this framework for Swift coroutines - https://github.com/belozierov/SwiftCoroutine

Unlike DispatchSemaphore, when you call await it doesn’t block the thread but only suspends coroutine, so you can use it in the main thread as well.

func awaitAPICall(_ url: URL) throws -> String? {
    let future = URLSession.shared.dataTaskFuture(for: url)
    let data = try future.await().data
    return String(data: data, encoding: .utf8)
}

func load(url: URL) {
    DispatchQueue.main.startCoroutine {
        let result1 = try self.awaitAPICall(url)
        let result2 = try self.awaitAPICall2(result1)
        let result3 = try self.awaitAPICall3(result2)
        print(result3)
    }
}