RequiredValidator constructor

const RequiredValidator([
  1. 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]);