IntegerValidator class

A validator that ensures a given double value is an integer.

The IntegerValidator checks if the provided value is a whole number (i.e., it has no decimal part). If the value is an integer, validation passes (null is returned). Otherwise, it returns the provided error message.

Example

final validator = IntegerValidator(message: 'The number must be an integer');

print(validator.validate(10.0)); // null (valid)
print(validator.validate(-5.0)); // null (valid)
print(validator.validate(3.14)); // 'The number must be an integer' (invalid)
print(validator.validate(null)); // 'The number must be an integer' (invalid)