isValidScreenName method Null safety

String? isValidScreenName(
  1. String? value
)

Validates the screen name.

Uses the username validation.

Implementation

static String? isValidScreenName(String? value) {
  if (value == null || value.isEmpty) {
    return "Field cannot be empty";
  }
  return value.isValidUsername ? null : "Not a valid screen name";
}