notEquals method Null safety

Validator notEquals(
  1. TextEditingController controller,
  2. {String message = "Validator.notEquals"}
)

Returns a Validator that accepts a value that is not equal to the controller's text.

Implementation

Validator notEquals(
  TextEditingController controller, {
  String message = "Validator.notEquals",
}) {
  return add(
    (value) => value == controller.text ? message : null,
  );
}