How to check for an empty struct ?

Question

I define a struct ... type Session struct { playerId string beehive string timestamp time.Time } Sometimes I assign an empty session to it (because nil is not possible) session = Session{}; Then I want to check, if it is empty: if session == Session{} { // do stuff... } Obviously this is not working. How do I write it?

Chris Gregori · Accepted Answer

You can use == to compare with a zero value composite literal because all fields are comparable: package main import ( "fmt" "time" ) type Session struct { playerId string beehive string timestamp time.Time } func main() { session := Session{} if (Session{}) == session { fmt.Println("zero") } } https://play.golang.org/p/wRUmxj1naS OR Using reflect.deepEqual also works, especially when you have map inside the struct package main import ( "fmt" "reflect" "time" ) type Session struct { playerId string beehive string timestamp time.Time } func (s Session) IsEmpty() bool { return reflect.DeepEqual(s, Session{}) } func main() { x := Session{} if x.IsEmpty() { fmt.Print("is empty") } } https://play.golang.org/p/ir9LpLymDj_r

Go Language

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