Go commentary #7: Releases, websockets, and struct behavior

Go 1.23 Release Note

• Full notes that you should skim through to get full-fledged of Go 1.23

A New Home for nhooyr/websocket

• nhooyr/websocket is adopted by Coder, CDE - Cloud Development Environment

Go structs are copied on assignment

• Inspired by Common Go Mistakes

type Thing struct {
    Name string
}

func main() {
  thing := Thing{"record"}
  other_thing := thing
  other_thing.Name = "banana"
  fmt.Println(thing)            // {record}
}

type Thing struct {
  Name string
}

func findThing(things []Thing, name string) *Thing {
  for _, thing := range things {
    if thing.Name == name {
      return &thing
    }
  }
  return nil
}

func main() {
  things := []Thing{Thing{"record"}, Thing{"banana"}}
  thing := findThing(things, "record")
  thing.Name = "gramaphone"
  fmt.Println(things)           // [{record} {banana}]
}

=> fix:

func findThing(things []Thing, name string) *Thing {
  for i := range things {
    if things[i].Name == name {
      return &things[i]
    }
  }
  return nil
}

func main() {
	x := []int{1, 2, 3, 4, 5}
	y := x[2:3]
	fmt.Println(y)
	y = append(y, 555)          // y = {3, 555}
	fmt.Println(x)              // {1, 2, 3, 555, 5}
}

=> fix:

func main() {
	x := []int{1, 2, 3, 4, 5}
	y := x[2:3:3]
	fmt.Println(y)
	y = append(y, 555)          // y = {3, 555}
	fmt.Println(x)              // {1, 2, 3, 4, 5}
}

---

• https://go.dev/doc/go1.23
• https://coder.com/blog/websocket
• https://github.com/coder/websocket
• https://jvns.ca/blog/2024/08/06/go-structs-copied-on-assignment/
• https://100go.co/