isPassword function

String? isPassword(
  1. String? val
)

return an error message if value does not pass the validation validation requires val: not equal null and length must be more than 7 characters

Implementation

String? isPassword(String? val) {
  return (val.toString().isNotEmpty && val.toString().length > 7)
      ? null
      : "Password must be up to 8 characters";
}