package common import "reflect" // Go lacks a simple and safe way to see if something is a typed nil. // See: // - https://dave.cheney.net/2017/08/09/typed-nils-in-go-2 // - https://groups.google.com/forum/#!topic/golang-nuts/wnH302gBa4I/discussion // - https://github.com/golang/go/issues/21538 func IsTypedNil(o interface{}) bool { rv := reflect.ValueOf(o) switch rv.Kind() { case reflect.Chan, reflect.Func, reflect.Map, reflect.Ptr, reflect.Slice: return rv.IsNil() default: return false } } // Returns true if it has zero length. func IsEmpty(o interface{}) bool { rv := reflect.ValueOf(o) switch rv.Kind() { case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice, reflect.String: return rv.Len() == 0 default: return false } }