Class DatePredicate

Optional [optionalSymbol]

not

• get not(): this

• Invert the following validators.

  Returns this

addValidator

• addValidator(validator): this

• Register a new validator.

  Parameters

  • validator: Validator<Date>

    Validator to register.

  Returns this

is

• is(validator): this

• Test if the value matches a custom validation function. The validation function should return true if the value passes the function. If the function either returns false or a string, the function fails and the string will be used as error message.

  Parameters

  • validator: ((value) => string | boolean)

    Validation function.

    • • (value): string | boolean

      • Parameters

        • value: Date

        Returns string | boolean

  Returns this

message

• message(newMessage): this

• Provide a new error message to be thrown when the validation fails.

  Parameters

  • newMessage: string | ValidatorMessageBuilder<Date>

    Either a string containing the new message or a function returning the new message.

  Returns this

  Example

  ow('🌈', 'unicorn', ow.string.equals('🦄').message('Expected unicorn, got rainbow'));
  //=> ArgumentError: Expected unicorn, got rainbow
  Copy

  Example

  ow('🌈', ow.string.minLength(5).message((value, label) => `Expected ${label}, to have a minimum length of 5, got \`${value}\``));
  //=> ArgumentError: Expected string, to be have a minimum length of 5, got `🌈`
  Copy

validate

• validate(customValidator): this

• Test if the value matches a custom validation function. The validation function should return an object containing a validator and message. If the validator is false, the validation fails and the message will be used as error message. If the message is a function, the function is invoked with the label as argument to let you further customize the error message.

  Parameters

  • customValidator: CustomValidator<Date>

    Custom validation function.

  Returns this