package validate // Validation error. var ( ErrMustHaveMoreItems = NewError("must have at least %d items") ErrMustHaveFewerItems = NewError("must have no more than %d 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 ErrMustHaveFewerItems } 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 ErrMustHaveMoreItems } return nil } }