What is the meaning of “dot parenthesis” syntax? [duplicate]
sess.Values[“user”] is an interface{}, and what is between parenthesis is called a type assertion. It checks that the value of sess.Values[“user”] is of type bson.ObjectId. If it is, then ok will be true. Otherwise, it will be false. For instance: var i interface{} i = int(42) a, ok := i.(int) // a == 42 and … Read more