CardValidator class

A validator that checks whether a given string is a valid credit or debit card number.

This validator ensures:

• The number consists of only digits (excluding spaces/hyphens).
• The length is between 13 and 19 digits.
• The number passes the Luhn Algorithm, which is used to validate card numbers.

Example

final cardValidator = CardValidator(message: 'Invalid card number');

print(cardValidator.validate('4111111111111111')); // null (valid)
print(cardValidator.validate('1234567812345678')); // 'Invalid card number' (invalid)

Parameters

• message: Custom error message when validation fails.

Inheritance

• Object
• Validator<String>
• ValidatorWithMessage<String>
• CardValidator

Constructors

CardValidator({required String message})

Creates a CardValidator instance with a custom error message.

Properties

hashCode → int

The hash code for this object.

no setter, inherited

message → String

The error message to be returned when validation fails.

final, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

validate(covariant String value) → String?

Validates the provided value.

override

Operators

operator ==(Object other) → bool

The equality operator.

inherited