Async code ​

spawn runs a function as a separate task and returns a promise; await waits for its result. Functions marked async can await inside them:

let answer = spawn(fn() => 6 * 7);
print(await answer);   // 42

A channel passes values between tasks. for (value in channel) waits for each value and stops when the channel is closed:

import { Channel } from "std:concurrency";

let numbers = Channel(10);
spawn(fn() {
    numbers.send(1);
    numbers.send(2);
    numbers.close();
});
for (n in numbers) {
    print(n);
}

Your turn ​

Start three tasks that each return a word, then wait for all of them with Promise.all and print the joined sentence.