MyList - step 6

For Comprehension

The MyList has a map and flatMap function
So we can use in a for comprehension

Exercise

@main
def main(): Unit =
  val result = for
      a <- MyList(1, 2, 3)
      b <- MyList(a, a + 1)
    yield
      b
  println(result)

This is the same as the example in the for

@main
def main(): Unit =
  val result = for
      a <- MyList(1, 2, 3)
      b <- MyList(a, a + 1)
    yield
      b
  println(result)

WithFilter

  def withFilter[A](f: A => MyList[B]): MyList[B]

In the scala for comprehension we can filter elements.
This is not the filter method but the withFilter method. In the standard libraries the withFilter is lazy, but that is for the advanced course
So for now we use our filter method as implementation

  def withFilter[A](f: A => MyList[B]): MyList[B] = filter(f)

@main
def main(): Unit =
  val result = for
    a <- MyList(1, 2, 3, 4, 5) if a < 3
  yield
    a
  println(result)