EitherExtensions.kt

fun String.eitherMail(): Either<String, String> =
        when {
            validMail(this) -> this.right()
            else -> "Invalid email".left()
        }

fun String.eitherPhoneNumber(): Either<String, String> =
        when {
            validNumber(this) -> this.right()
            else -> "Invalid phone number".left()
        }