Comments on: Revised Scala Exercises http://blog.tmorris.net/revised-scala-exercises/ The weblog of Tony Morris Sat, 04 Feb 2012 12:40:02 +0000 http://wordpress.org/?v=2.6 By: Tony Morris http://blog.tmorris.net/revised-scala-exercises/#comment-19350 Tony Morris Mon, 13 Oct 2008 21:10:06 +0000 http://blog.tmorris.net/revised-scala-exercises/#comment-19350 Hi Stefan, sorry for the late reply. If you're using the Scala REPL, then the definition of Empty comes after the declaration of List, so it fails. The <code>[+A]</code> denotes covariance in the type parameter A. So if T is a subtype of U, then List[T] is a subtype of List[U]. In contrast to Java, where all type parameters are invariant. For example, a List<String> is not a List<CharSequence> even though a String is a CharSequence. Hi Stefan, sorry for the late reply. If you’re using the Scala REPL, then the definition of Empty comes after the declaration of List, so it fails.

The [+A] denotes covariance in the type parameter A. So if T is a subtype of U, then List[T] is a subtype of List[U]. In contrast to Java, where all type parameters are invariant. For example, a List<String> is not a List<CharSequence> even though a String is a CharSequence.

]]> By: Karri-Pekka Laakso http://blog.tmorris.net/revised-scala-exercises/#comment-19315 Karri-Pekka Laakso Mon, 13 Oct 2008 16:45:57 +0000 http://blog.tmorris.net/revised-scala-exercises/#comment-19315 Stefan: I used the same version and couldn't compile it inside the interpreter. However, I pasted all of the code into one file, compiled it with scalac and launched the interpreter with<pre>scala -cp .</pre> => Works. Stefan: I used the same version and couldn’t compile it inside the interpreter. However, I pasted all of the code into one file, compiled it with scalac and launched the interpreter with 
scala -cp .

=> Works.

]]> By: Stefan Wagner http://blog.tmorris.net/revised-scala-exercises/#comment-17878 Stefan Wagner Sat, 04 Oct 2008 02:55:35 +0000 http://blog.tmorris.net/revised-scala-exercises/#comment-17878 Why do I get this error: <code> sealed trait List[+A] { | override def toString = { | def toScalaList(t: List[A]): scala.List[A] = t match { | case Empty => Nil | case Cons(h, t) => h :: toScalaList(t) | } | toScalaList(this).toString | } | } :7: error: not found: value Empty case Empty => Nil ^ :8: error: not found: value Cons case Cons(h, t) => h :: toScalaList(t) ^ :8: error: not found: value h case Cons(h, t) => h :: toScalaList(t) </code> And why is it List[+A], and not just List[A]? I used scala-2.7.1-final to try this out. Why do I get this error:


sealed trait List[+A] {
| override def toString = {
| def toScalaList(t: List[A]): scala.List[A] = t match {
| case Empty => Nil
| case Cons(h, t) => h :: toScalaList(t)
| }
| toScalaList(this).toString
| }
| }
:7: error: not found: value Empty
case Empty => Nil
^
:8: error: not found: value Cons
case Cons(h, t) => h :: toScalaList(t)
^
:8: error: not found: value h
case Cons(h, t) => h :: toScalaList(t)

And why is it List[+A], and not just List[A]?

I used scala-2.7.1-final to try this out.

]]> By: λ Tony’s blog λ » Blog Archive » 20 Intermediate Scala Exercises http://blog.tmorris.net/revised-scala-exercises/#comment-13822 λ Tony’s blog λ » Blog Archive » 20 Intermediate Scala Exercises Wed, 10 Sep 2008 03:36:53 +0000 http://blog.tmorris.net/revised-scala-exercises/#comment-13822 [...] will be publishing answers to these exercises as well as the Revised Scala Exercises in the near future. In the meantime, see if you can tackle the exercises below. In almost all [...] [...] will be publishing answers to these exercises as well as the Revised Scala Exercises in the near future. In the meantime, see if you can tackle the exercises below. In almost all [...]

]]> By: Tony Morris http://blog.tmorris.net/revised-scala-exercises/#comment-11768 Tony Morris Tue, 02 Sep 2008 12:48:34 +0000 http://blog.tmorris.net/revised-scala-exercises/#comment-11768 Here is a message from Ben, <a href="http://blog.tmorris.net/sorry-ben/" rel="nofollow">which for the third time, failed to show after I Approved it in the Wordpress admin panel</a> <em>sigh</em>. <blockquote> Hi Tony, My question was about the pred() function/case (or lack thereof), which appears in the previous Scala and Haskell versions, but not in this one. Why is that? </blockquote> Hello Ben, I didn't write the pred/succ functions because they are a bit of a red herring. They are not required to implement any of the exercises. Here is a message from Ben, which for the third time, failed to show after I Approved it in the Wordpress admin panel sigh.

Hi Tony,

My question was about the pred() function/case (or lack thereof), which appears in the previous Scala and Haskell versions, but not in this one.

Why is that?

Hello Ben, I didn’t write the pred/succ functions because they are a bit of a red herring. They are not required to implement any of the exercises.

]]> By: Ben Hutchison http://blog.tmorris.net/revised-scala-exercises/#comment-11752 Ben Hutchison Tue, 02 Sep 2008 12:00:55 +0000 http://blog.tmorris.net/revised-scala-exercises/#comment-11752 Hi Tony, My question was about the pred() function/case (or lack thereof), which appears in the previous Scala and Haskell versions, but not in this one. Why is that? Hi Tony,

My question was about the pred() function/case (or lack thereof), which appears in the previous Scala and Haskell versions, but not in this one.

Why is that?

]]> By: Jeff http://blog.tmorris.net/revised-scala-exercises/#comment-2450 Jeff Tue, 29 Jul 2008 08:47:59 +0000 http://blog.tmorris.net/revised-scala-exercises/#comment-2450 Thanks Tony These exercises are a big improvement and really improved my understanding. 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These exercises are a big improvement and really improved my understanding. I finally figured out how to stop all my methods depending on reverse.

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