Go Brain Teasers/

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Puzzle 18 Explanation: Go Job

Puzzle 18 Explanation: Go Job

Understand how structures work in Go.

We'll cover the following...

Try it yourself

Try executing the code below to see the result for yourself.

Go (1.16.5)
package main
import (
	"fmt"
)
type Job struct {
	State string
	done  chan struct{}
}
func (j *Job) Wait() {
	<-j.done
}
func (j *Job) Done() {
	j.State = "done"
	close(j.done)
}
func main() {
	ch := make(chan Job)
	go func() {
		j := <-ch
		j.Done()
	}()
	job := Job{"ready", make(chan struct{})}
	ch <- job
	job.Wait()
	fmt.Println(job.State)
}

Explanation

At first glance, the code looks fine. We’re using a pointer receiver in the Job struct ...