validatetext method

String? validatetext(
  1. String? value
)

Implementation

String? validatetext(String? value) {
  if (value == null || value.isEmpty) return "Please enter your answer";
  if (value.length <4) {
    return "Atleast 4 characters!";
  }
  if (value.length >= 150) {
    return "Below 150 characters!";
  }
  return null;
}