async arrow function

1const foo = async () => {
2  // do something
3}
4

1Async arrow functions look like this:
2
3const foo = async () => {
4  // do something
5}
6Async arrow functions look like this for a single argument passed to it:
7
8const foo = async evt => {
9  // do something with evt
10}
11Async arrow functions look like this for multiple arguments passed to it:
12
13const foo = async (evt, callback) => {
14  // do something with evt
15  // return response with callback
16}
17The anonymous form works as well:
18
19const foo = async function() {
20  // do something
21}
22An async function declaration looks like this:
23
24async function foo() {
25  // do something
26}
27Using async function in a callback:
28
29const foo = event.onCall(async () => {
30  // do something
31})