Improving efficiency using async-let

Even though your app is now responsive to button taps and is able to update the user interface while the makeToast() and poachEgg() methods are running, both methods still execute sequentially. The solution here is to use async-let. Writing async in front of a let statement when you define a constant, and then writing await when you access the constant, allows parallel execution of asynchronous methods:

async let temporaryConstant1 = methodName1()
async let temporaryConstant2 = methodName2()
await variable1 = temporaryConstant1
await variable2 = temporaryConstant1

Here, methodName1() and methodName2() will run in parallel.

You will modify your app to use async-let to enable the makeToast() and poachEgg() methods to run in parallel. In the ViewController file, modify the code in the Task block as follows:

Task {
   let startTime = Date().timeIntervalSince1970
   toastLabel.text = "Making toast..."
   async let tempToast...