minLengthValidator function

String? Function(String?) minLengthValidator(
  1. int minLength,
  2. String fieldName
)

Validates that the value meets minimum length requirement.

Implementation

String? Function(String?) minLengthValidator(int minLength, String fieldName) {
  return (value) {
    if (value == null || value.length < minLength) {
      return '$fieldName must be at least $minLength characters';
    }
    return null;
  };
}