What is reflection in Go and how is it used?

Reflection in Go: • Runtime type inspection and manipulation • reflect package provides functionality • Type and Value are main types • Performance overhead • Used in JSON marshaling, ORMs, etc. Example: func inspect(x interface{}) { v := reflect.ValueOf(x) t := reflect.TypeOf(x) fmt.Printf("Type: %v\n", t) fmt.Printf("Value: %v\n", v) if v.Kind() == reflect.Struct { for i := 0; i < v.NumField(); i++ { field := t.Field(i) value := v.Field(i) fmt.Printf("%s: %v\n", field.Name, value) } } } Use cases: • Serialization/deserialization • Dependency injection • Generic programming (pre-generics) • Testing frameworks