functional-dsl-blog-9.scala

functional-dsl-blog-9.scala

  case class EmailFilter(run: Email => Boolean) { self =>
    def &&(that: EmailFilter): EmailFilter =
      EmailFilter(email => self.run(email) && that.run(email))
    def ||(that: EmailFilter): EmailFilter =
      EmailFilter(email => self.run(email) || that.run(email))
    def negate : EmailFilter =
      EmailFilter(email => !self.run(email))
  }

  object EmailFilter {
    val always: EmailFilter = EmailFilter(_ => true)
  }