FieldValidator

A type alias for field validation functions.

A field validator is a function that takes a field value and returns a FieldError. If validation passes, it should return noFieldError. If validation fails, it should return a FieldError containing the validation error messages.

Usage:

val emailValidator: FieldValidator<String> = { email ->
    if (email.contains("@")) noFieldError
    else FieldError(listOf("Must be a valid email"))
}

Parameters