validateName method

String? validateName(
  1. String? value
)

Implementation

String? validateName(String? value) {
  if (value == null || value.isEmpty) return "Please enter your name";
  if (value.length <3) {
    return "Atleast 3 characters!";
  }
  if (value.length >= 50) {
    return "The name must not be greater than 50 characters";
  }
  return null;
}