RequiredValidator constructor
const
RequiredValidator([
- String? errorMessage
A validator that checks if a value is required.
The RequiredValidator class is a generic class that extends the EasyValidator class. It provides a method to validate a value and returns an error message if the value is null or empty.
Example usage:
final validator = RequiredValidator('Value is required');
String? result = validator.validate('Hello');
print(result); // null
result = validator.validate('');
print(result); // 'Value is required'
Implementation
const RequiredValidator([super.errorMessage]);