async and await

1function resolveAfter2Seconds() {
2  return new Promise(resolve => {
3    setTimeout(() => {
4      resolve('resolved');
5    }, 2000);
6  });
7}
8
9//async function:
10async function asyncCall() {
11  console.log('calling');
12  const result = await resolveAfter2Seconds();
13  console.log(result);
14  // expected output: 'resolved'
15}
16
17asyncCall();

1using System;
2using System.Threading.Tasks;
3
4namespace AsyncBreakfast
5{
6    class Program
7    {
8        static void Main(string[] args)
9        {
10            Coffee cup = PourCoffee();
11            Console.WriteLine("coffee is ready");
12
13            Egg eggs = FryEggs(2);
14            Console.WriteLine("eggs are ready");
15
16            Bacon bacon = FryBacon(3);
17            Console.WriteLine("bacon is ready");
18
19            Toast toast = ToastBread(2);
20            ApplyButter(toast);
21            ApplyJam(toast);
22            Console.WriteLine("toast is ready");
23
24            Juice oj = PourOJ();
25            Console.WriteLine("oj is ready");
26            Console.WriteLine("Breakfast is ready!");
27        }
28
29        private static Juice PourOJ()
30        {
31            Console.WriteLine("Pouring orange juice");
32            return new Juice();
33        }
34
35        private static void ApplyJam(Toast toast) => 
36            Console.WriteLine("Putting jam on the toast");
37
38        private static void ApplyButter(Toast toast) => 
39            Console.WriteLine("Putting butter on the toast");
40
41        private static Toast ToastBread(int slices)
42        {
43            for (int slice = 0; slice < slices; slice++)
44            {
45                Console.WriteLine("Putting a slice of bread in the toaster");
46            }
47            Console.WriteLine("Start toasting...");
48            Task.Delay(3000).Wait();
49            Console.WriteLine("Remove toast from toaster");
50
51            return new Toast();
52        }
53
54        private static Bacon FryBacon(int slices)
55        {
56            Console.WriteLine($"putting {slices} slices of bacon in the pan");
57            Console.WriteLine("cooking first side of bacon...");
58            Task.Delay(3000).Wait();
59            for (int slice = 0; slice < slices; slice++)
60            {
61                Console.WriteLine("flipping a slice of bacon");
62            }
63            Console.WriteLine("cooking the second side of bacon...");
64            Task.Delay(3000).Wait();
65            Console.WriteLine("Put bacon on plate");
66
67            return new Bacon();
68        }
69
70        private static Egg FryEggs(int howMany)
71        {
72            Console.WriteLine("Warming the egg pan...");
73            Task.Delay(3000).Wait();
74            Console.WriteLine($"cracking {howMany} eggs");
75            Console.WriteLine("cooking the eggs ...");
76            Task.Delay(3000).Wait();
77            Console.WriteLine("Put eggs on plate");
78
79            return new Egg();
80        }
81
82        private static Coffee PourCoffee()
83        {
84            Console.WriteLine("Pouring coffee");
85            return new Coffee();
86        }
87    }
88}
89

1async function f() {
2
3  try {
4    let response = await fetch('/no-user-here');
5    let user = await response.json();
6  } catch(err) {
7    // catches errors both in fetch and response.json
8    alert(err);
9  }
10}
11
12f();

1function resolveAfter2Seconds() {
2  return new Promise(resolve => {
3    setTimeout(() => {
4      resolve('resolved');
5    }, 2000);
6  });
7}
8
9async function asyncCall() {
10  console.log('calling');
11  const result = await resolveAfter2Seconds();
12  console.log(result);
13  // expected output: 'resolved'
14}
15
16asyncCall();
17

1function delayResult() {
2 return new Promise(resolve => {
3   setTimeout(() => {
4     resolve(‘Done’);
5   }, 5000)
6 })
7}
8async function getResult() {
9 let result = await delayResult();
10 return result;
11}
12getResult();