Validator<S> class sealed

Base class for all validators.

Validators check if a state value meets certain criteria. They return true for valid, false for invalid.

Example:

const validator = Validator.required();
validator.isValid('hello'); // true
validator.isValid('');      // false

Implementers

• CustomValidator
• DependantValidator
• LengthValidator
• PatternValidator
• RequiredValidator

Constructors

Validator.custom(bool isValidCallback(S state))

Creates a validator with custom logic.

const

factory

Validator.exactLength(int value)

Validates exact length for strings/iterables.

const

factory

Validator.maxLength(int value)

Validates maximum length for strings/iterables.

const

factory

Validator.minLength(int value)

Validates minimum length for strings/iterables.

const

factory

Validator.required()

Validates that the value is not empty/null.

const

factory

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

isValid(S state) → bool

Returns true if the state is valid according to this validator's rules.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited