第89讲：Scala中使用For表达式实现内幕思考

第89讲：Scala中使用For表达式实现内幕思考

object For_Advanced {
  def main(args: Array[String]) {}
   
   def map[A, B](list: List[A], f: A => B): List[B] =
     for(element <- list) yield f(element)
   def flatMap[A, B](list: List[A], f: A => List[B]): List[B] =
     for(x <- list; y <- f(x)) yield y
   def filter[A](list: List[A], f: A => Boolean): List[A] =
     for(elem <- list if f(elem)) yield elem
 }

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