Use Go Channels as Promises and Async/Await

1asyncawait.js

// Javascript.

const longRunningTask = async () => {
    // Simulate a workload.
    sleep(3000)
    return Math.floor(Math.random() * Math.floor(100))
}

const [a, b, c] = await Promise.all(longRunningTask(), longRunningTask(), longRunningTask())
console.log(a, b, c)

2asyncawait.go

// Go.

package main

import (
	"fmt"
        "math/rand"
	"time"
)

func longRunningTask() <-chan int32 {
	r := make(chan int32)

	go func() {
		defer close(r)
		
		// Simulate a workload.
		time.Sleep(time.Second * 3)
		r <- rand.Int31n(100)
	}()

	return r
}

func main() {
	aCh, bCh, cCh := longRunningTask(), longRunningTask(), longRunningTask()
	a, b, c := <-aCh, <-bCh, <-cCh
	
	fmt.Println(a, b, c)
}