gmane.comp.lang.scala.user

Re: Puzzled by outcome of if else expression

Tim Underwood — 2012-05-25T21:28:57

The compiler complained for me.  You probably had isFullTimeEmployed
already defined in your REPL session which is why it worked for you.  If
you try the code again in a fresh REPL session you'll see the compiler
error.

-Tim

On Fri, May 25, 2012 at 2:19 PM, Robby Pelssers <robby.pelssers-DxH85bgnsLcAvxtiuMwx3w< at >public.gmane.org>wrote:

RE: Puzzled by outcome of if else expression

Robby Pelssers — 2012-05-25T21:19:40

Ok.. made a typo 
 if (isFullTimeEmployed) should have been (isFulltimeEmployed)

Strange that the compiler didn't complain.
Robby

-----Oorspronkelijk bericht-----
Van: scala-user-/JYPxA39Uh5TLH3MbocFFw< at >public.gmane.org namens Robby Pelssers
Verzonden: vr 25-5-2012 22:44
Aan: scala-user-/JYPxA39Uh5TLH3MbocFFw< at >public.gmane.org
Onderwerp: [scala-user] Puzzled by outcome of if else expression
 
Hi all,

Can someone explain why belinda is working fulltime instead of parttime in below code snippet?
Thx in advance,
Robby

scala> class Employee(employeeId: Integer, isFulltimeEmployed: Boolean) {
     |     /** We can't register an employee without employeeId **/
     |     if (employeeId == null) {
     |         throw new NullPointerException("employeeId was null")
     |     }
     |     /** we can override the primary constructor **/
     |     def this(employeeId: Integer) = this(employeeId, true)
     |     override def toString() = employeeId + " works " + (if (isFullTimeEmployed) "fulltime" else "parttime")

Re: Puzzled by outcome of if else expression

Michael Schmitz — 2012-05-25T21:10:04

I reached the same conclusion.

Code works fine after correcting the typo.

Michael


On Fri, May 25, 2012 at 2:07 PM, Tim Underwood <timunderwood-Re5JQEeQqe8AvxtiuMwx3w< at >public.gmane.org>wrote:

Re: Puzzled by outcome of if else expression

Tim Underwood — 2012-05-25T21:07:04

Looks like a typo:  The constructor has "isFull*t*imeEmployed" but your
toString method has isFull*T*imeEmployed (lowercase "time" vs uppercase
"Time").

-Tim

On Fri, May 25, 2012 at 1:44 PM, Robby Pelssers <robby.pelssers-DxH85bgnsLcAvxtiuMwx3w< at >public.gmane.org>wrote:

Re: Trouble writing Hadoop MapReduce in Scala

Lanny Ripple — 2012-05-25T20:57:51

Been doing Hadoop for about two years now with Scala.  Our usual
boilerplate is

object MyMapperHelper with
CassFedMapReduce[LongWritable,Text,Text,LongWritable] {
  val MapperClass = classOf[MyMapper]
  val ReducerClass = classOf[MyReducer]
}
import MyMapperHelper.{OurMapperType, OurReducerType}  // type aliases
defined in HadoopMapReduce

class MyMapper extends OurMapperType {

  private val outkey = new Text();
  private val one = new LongWritable(1)

  def writeContext(k: String)(implicit context: OurMapperType#Context)
{
    outkey.set(k)
    //  maybe update a counter or other `context` specific item here
    context.write(outkey, one)
  }

  override
  def map(key: ByteBuffer, columns: java.util.SortedMap[ByteBuffer,
IColumn], context: OurMapperType#Context) {
    implicit val mContext = context
    ...
    splits.foreach{contextWrite _}
  }
}

CassFedMap[K,V] and CassFedMapReduce[K,V,RK,RV] extends
CassFedMap[K,V] are classes that do a lot of the setup for the job
when they are constructed given the

Puzzled by outcome of if else expression

Robby Pelssers — 2012-05-25T20:44:11

Hi all,

Can someone explain why belinda is working fulltime instead of parttime in below code snippet?
Thx in advance,
Robby

scala> class Employee(employeeId: Integer, isFulltimeEmployed: Boolean) {
     |     /** We can't register an employee without employeeId **/
     |     if (employeeId == null) {
     |         throw new NullPointerException("employeeId was null")
     |     }
     |     /** we can override the primary constructor **/
     |     def this(employeeId: Integer) = this(employeeId, true)
     |     override def toString() = employeeId + " works " + (if (isFullTimeEmployed) "fulltime" else "parttime")
     | }
warning: there were 3 deprecation warnings; re-run with -deprecation for details
defined class Employee

scala>

scala> val john = new Employee(12545, true)
john: Employee = 12545 works fulltime

scala> val belinda = new Employee(32567, false)
belinda: Employee = 32567 works fulltime

scala> val herman = new Employee(56784)
herman: Employee = 56784 works fulltime

scala> val ivan = n

Re: Central Scala Archiving Network Site?

Daniel Sobral — 2012-05-25T20:17:27

By the way, this is supported directly from sbt, with the sbt-ls plugin:

dcs< at >shadowfax:~/github/sampleProject$ sbt
[info] Loading global plugins from /home/dcs/.sbt/plugins/project
[info] Loading global plugins from /home/dcs/.sbt/plugins
[info] Set current project to default-0198bc (in build
file:/home/dcs/github/sampleProject/)
default-0198bc:->ls specs2
[info] Fetching library info matching specs2
[info] - specs2 (1.9, 1.8.2, 1.8.1, 1.8-SNAPSHOT, 1.7.1, 1.7-SNAPSHOT,
1.6.1, 1.10) # specs2
[info] - scalatra-specs2 (2.1.0.M2)
             # Specs2 support for the Scalatra test framework
[info] - testgen-sbt (0.3.0, 0.2, 0.1)
             # Scala Unit Test Template Generator
[success] Total time: 10 s, completed May 25, 2012 5:15:45 PM
default-0198bc:->ls-install specs2< at >1.10
Discovered library specs2< at >1.10
Evaluating and installling specs2< at >1.10
[info] Reapplying settings...
[info] Set current project to default-0198bc (in build
file:/home/dcs/github/sampleProject/)
[info] Reapplying settings...
[info] Set c

Re: Generics in Scala: implementing an interface/trait twice?

Andrei Pozolotin — 2012-05-25T20:07:12

Eugene: 

now that macros are part of scala, 
how would you express a macro for my use case?

thanks

Andrei.

On Sunday, October 30, 2011 2:32:36 PM UTC-5, Eugene Burmako wrote:

Re: Central Scala Archiving Network Site?

Wendell Hatcher — 2012-05-25T19:23:58

Josh,

this is a very good idea, I love the site and you are right with a
little tweaking it would make a great CSAN repo.

How can I reach out to the creator and work with him on getting up and
running as a CSAN site?

We can then work on linking it to the Scala docs site for users to
goto for all of their coding needs. One of the greatest tools of
Perl,Python and Ruby is their own modules. I think Scala`s going to
have more and more code of its own as more users begin learning the
language.


Finally, a Archive Network site seems to promote users to create more
custom code for others not sure why but it just seems to work.


-Dell

On May 25, 10:38 am, Josh Suereth <joshua.suer...-Re5JQEeQqe8AvxtiuMwx3w< at >public.gmane.org> wrote:

Re: Central Scala Archiving Network Site?

Wendell Hatcher — 2012-05-25T19:19:08

Thanks Josh,

It has been mentioned that the mavenrepository is used for this. I
think that this repository should be placed on the front of the Scala
website for noobs like myself. That way we know where to look for
code. But, I still think a CSAN repository similar to CPAN is a better
option because of the directory structure and thought put into it.

And, it would be better than just a wiki. It could be added to the new
Scala documentation site as a link.


-Wendell

On May 25, 10:19 am, Josh Suereth <joshua.suer...-Re5JQEeQqe8AvxtiuMwx3w< at >public.gmane.org> wrote:

Re: Central Scala Archiving Network Site?

Sonnenschein — 2012-05-25T18:35:57

Sorry, Josh, it was not obvious to me how to navigate: Hoovering over
the title I get a hand-pointer and klicking on it leads me to the very
same page. The search text box below the title is rather fade and the
focus isn't  set to it so I didn't realize it at all - normally, they
have a button 'Search' additionally. After that I interpreted your
words "I know I want/plan to. It's a terrific idea" such that the site
was just under construction. Maybe Dough can make the intro site more
intuitive...?

Peter

Re: Finally...Scala Puzzlers!

Michael Schmitz — 2012-05-25T17:05:09

Cool!  Can we have multiple-answer puzzlers?

On Thu, May 24, 2012 at 4:59 PM, Andrew Phillips <sharedocs1-Re5JQEeQqe8AvxtiuMwx3w< at >public.gmane.org> wrote:

Re: Scala/Scala.NET, How are you supposed to use third-party libraries for cross-platform development ?

sreque — 2012-05-25T17:04:54

My understanding is that with IKVM, you can convert any java code to run on 
.Net, including third-party libraries. In that sense, you can write code 
that runs on the JVM and also run it on the CLR. I don't think the reverse 
direction works, though.

See  
http://sourceforge.net/apps/mediawiki/ikvm/index.php?title=User%27s_Guide 

On Friday, May 25, 2012 7:53:34 AM UTC-5, jsamot wrote:

Re: Re: Central Scala Archiving Network Site?

Josh Suereth — 2012-05-25T16:38:16

What do you mean a fake?   It's a catalog of available libraries and where
to find them.

Binary distribution mechanisms right now use Maven repositories.  It's a
de-facto standard in Java that could be better, but is at least standard.

On Fri, May 25, 2012 at 12:33 PM, Sonnenschein <peter.empen-KvP5wT2u2U0< at >public.gmane.org> wrote:

Re: Central Scala Archiving Network Site?

Sonnenschein — 2012-05-25T16:33:30

As that's currently just a fake, what is planned to be hosted on
ls.implicit.ly?

Re: Central Scala Archiving Network Site?

Josh Suereth — 2012-05-25T16:19:38

More importantly, Doug started this site:  http://ls.implicit.ly/

I think it has the potential to be a CPAN if we can all get behind and and
support it.  I know I want/plan to.  It's a terrific idea and a bit better
than just a wiki.

- Josh

On Fri, May 25, 2012 at 12:05 PM, Sylvain HENRY <hsyl20-Re5JQEeQqe8AvxtiuMwx3w< at >public.gmane.org> wrote:

Re: Central Scala Archiving Network Site?

Sylvain HENRY — 2012-05-25T16:05:28

In the JVM world, Maven repositories are used for this.
In addition, some Scala specific libraries are listed here: 
https://wiki.scala-lang.org/display/SW/Tools+and+Libraries

Cheers
Sylvain

Le 25/05/2012 17:29, Wendell Hatcher a écrit :

Re: Central Scala Archiving Network Site?

Paul Keeble — 2012-05-25T16:08:28

Have you seen SBT (Scala Build Tool) and in particular Maven? They both
work from the Maven repository ( http://mvnrepository.com/ for
searching) that gives us a list of almost all the libraries and their
dependencies with auto update from within the build tools. Its the main
place the Java developers go for their libraries and Scala is using it as
well. If the library isn't in there then it'll have a custom repository
that fits the standard.

Its not quite perfect due to the binary compatibility of Scala between
major releases and subsequent naming that goes on for targeting 2.8 and 2.9
but its a thoroughly battle hardened approach.

PK

On 25 May 2012 16:29, Wendell Hatcher <wendellhatcher1074-Re5JQEeQqe8AvxtiuMwx3w< at >public.gmane.org> wrote:

Re: BigDecimal differences

Viktoras Agejevas — 2012-05-25T15:55:31

Oh, I see. Thanks guys.

Viktoras

On Fri, May 25, 2012 at 6:39 PM, Antoine Gourlay
<antoine.gourlay.ecn-Re5JQEeQqe8AvxtiuMwx3w< at >public.gmane.org> wrote:

Re: BigDecimal differences

Antoine Gourlay — 2012-05-25T15:39:24

Hi,

It is a bug with the handling of MathContext instances, if you specify 
one by hand it work without problem:

Welcome to Scala version 2.9.1-1 (Java HotSpot(TM) 64-Bit Server VM, 
Java 1.6.0_29).
Type in expressions to have them evaluated.
Type :help for more information.

scala> BigDecimal(10).pow(50).remainder(BigDecimal(6))
java.lang.ArithmeticException: Division impossible
     at java.math.BigDecimal.divideToIntegralValue(BigDecimal.java:1783)
     at java.math.BigDecimal.divideAndRemainder(BigDecimal.java:1916)
     at java.math.BigDecimal.remainder(BigDecimal.java:1850)
     at scala.math.BigDecimal.remainder(BigDecimal.scala:256)
     at .<init>(<console>:8)
     at .<clinit>(<console>)
     at .<init>(<console>:11)
     at .<clinit>(<console>)
     at $print(<console>)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodA

Central Scala Archiving Network Site?

Wendell Hatcher — 2012-05-25T15:29:19

Hi,

I am a Scala Noob and so far love the language. I am coming from a
Perl background so the power of the language combined with the JVM
still amazes me.


Being from a Perl background one of the greatest things about Perl is
the CPAN server that has everything you could possible need or want in
Perl in one location.


What are the thoughts of users and developers of have a CSAN(Central
Scala Archive Network) for Scala open source code? I ask this because
as I look around on the internet I am seeing more and more Scala
projects popping up but the user/developer has to comb the internet to
find great these.


Finally, I think that Scala is going to continue to grow as its own
language and not look to Java imports as much in the future as more
users come aboard.



-Dell