Re: Re: What does this mean ?

     Hello,

  The receive method takes one partial function. A partial function can
consist of multiple case statements.

scala> val pf : PartialFunction[Int, String] = { case 1 => "one"; case 2=>
"two"}
pf: PartialFunction[Int,String] = <function1>

scala> (1 to 10).collect(pf)
res1: scala.collection.immutable.IndexedSeq[String] = Vector(one, two)

     Best, Oliver

On Sun, Apr 10, 2016 at 11:20 PM, John Michael Lafayette <
[email protected]> wrote:

> So the "receive" method takes in an arbitrary number of partial functions
> of type partialFunction[Any, A] as its parameter and it dynamically
> checks the input against each partial function using isDefinedAtuntil it
> gets a match.
>
> But the type signature for receive is: receive[A](f: PartialFunction[Any,
> A]): A
>
> It should only take in a single partial function, f, not a vararg or list
> or array of partial functions. Is " case Stop => Console.println("Pong:
> stop") " a single partial function or is it part of a single partial
> function object?
>
>
>
>
> On Wednesday, February 17, 2016 at 9:40:20 AM UTC-5, Clement Dourval wrote:
>>
>> Hi, I'm currently Learning Scala and more precisely, concurrent
>> programming with scala.
>>
>> I found this code :
>>
>> class Pong extends Actor {
>>   def act() {
>>     var pongCount = 0
>>     while (true) {
>>       receive {
>>         case Ping =>
>>           if (pongCount % 1000 == 0)
>>             Console.println("Pong: ping "+pongCount)
>>           sender ! Pong
>>           pongCount = pongCount + 1
>>         case Stop =>
>>           Console.println("Pong: stop")
>>           exit()
>>       }
>>     }
>>   }
>> }
>>
>> This is from a tutorial, so i'm expecting it to work, the only problem is
>> I do not understand how.
>>
>> The main problem is, how does this code use the case keyword since there
>> is no match !
>> (adress of the tutorial : http://www.scala-lang.org/old/node/242)
>>
>> Anyway, i understood what was the tutorial was supposed to do (with ping
>> pong), I just don't understand what is written, I'd like to be able to
>> write it myself.
>> But it seems i'm missing some syntax subtleties
>> And even if these are deprecated, i found the same synthax with the akka
>> Library ! So I'm asking myself how to read this.
>>
>> Anyone can help ? Thanks in advance !
>>
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-- 
Oliver Ruebenacker
Senior Software Engineer, Diabetes Portal
<http://www.type2diabetesgenetics.org/>, Broad Institute
<http://www.broadinstitute.org/>

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