Beginning Networking with URLSession

Sep 13 2022 · Swift 5.6, iOS 15, Xcode 13.4.1

Part 1: Introduction to URLSession & Concurrency

02. Introduction to Modern Concurrency

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Notes: 02. Introduction to Modern Concurrency

Concurrency - The Swift Programming Language

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URLSession is designed to access networks beyond your user’s device. Doing so takes time; whether to upload data or respond to a chat message. That’s time the user can be doing other things.

Task {
  print("Doing some work on a task.")
}

print("Doing work on the main actor (main thread).")

Task {
  print("This is first.")
    
  let sum = (1...100000).reduce(0, +)
  print("This is second: 1 + 2 + 3 ... 100 = \(sum)")
}

print("This is last.")

let task = Task {
  print("This is first.")
    
  let sum = (1...100000).reduce(0, +)
  try Task.checkCancellation()
  print("This is second: 1 + 2 + 3 ... 100 = \(sum)")
}

print("This is last.")
task.cancel()

Task {
  print("Starting the task.")
  try await Task.sleep(nanoseconds: 1_000_000_000)
  print("Finishing the task.")
}

func performTask() {
  print("Starting the task in a function.")
  try await Task.sleep(nanoseconds: 1_000_000_000)
  print("Finishing the task in a function.")
}

func performTask() throws {

func performTask() async throws {

Task {
  try await performTask()
}

func fetchDomains() async throws -> [Domain] {
  []
}

func fetchDomains() async throws -> [Domain] {
  let url = URL(string: "https://api.raywenderlich.com/api/domains")!
  let (data, _) = try await URLSession.shared.data(from: url)
    
  return try JSONDecoder().decode(Domains.self, from: data).data
}

Task {
  do {
    let domains = try await fetchDomains()
    for (index, domain) in domains.enumerated() {
      let attr = domain.attributes
      print("\(index + 1)) \(attr.name): \(attr.description) - \(attr.level)")
    }
  } catch {
    print(error)
  }
}