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Concurrency comparison Swift async/await and Clojure core.async
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| (require '[clojure.core.async :refer [go <!]]) | |
| (defn fetch-user-id [server] | |
| (go | |
| (if (= server "primary") | |
| 97 | |
| 501))) | |
| (defn fetch-username [server] | |
| (go | |
| (let [user-id (<! (fetch-user-id server))] | |
| (if (= user-id 501) | |
| "John Appleseed" | |
| "Guest")))) | |
| (defn connect-user [server] | |
| (go | |
| (let [user-id-ch (fetch-user-id server) | |
| username-ch (fetch-username server) | |
| greeting (str "Hello " (<! username-ch) ", user ID " (<! user-id-ch))] | |
| (println greeting)))) | |
| (go | |
| (connect-user "primary")) |
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| func fetchUserID(from server: String) async -> Int { | |
| if server == "primary" { | |
| 97 | |
| } else { | |
| 501 | |
| } | |
| } | |
| func fetchUsername(from server: String) async -> String { | |
| let userID = await fetchUserID(from: server) | |
| if userID == 501 { | |
| return "John Appleseed" | |
| } else { | |
| return "Guest" | |
| } | |
| } | |
| func connectUser(to server: String) async { | |
| async let userID = fetchUserID(from: server) | |
| async let username = fetchUsername(from: server) | |
| let greeting = await "Hello \(username), user ID \(userID)" | |
| print(greeting) | |
| } | |
| Task { | |
| await connectUser(to: "primary") | |
| } |
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