package validate import ( "errors" ) // Validation error. var ( ErrTooFewItems = errors.New("too few items") ErrTooManyItems = errors.New("too many items") ) // MaxSize validates the length of a slice as being less than or equal to a given maximum. func MaxSize[T any](l int) func([]T) error { return func(value []T) error { if len(value) > l { return ErrTooManyItems } return nil } } // MinSize validates the length of a slice as being greater than or equal to a given minimum. func MinSize[T any](l int) func([]T) error { return func(value []T) error { if len(value) < l { return ErrTooFewItems } return nil } }