Comments on: Getting around static typing in Scala

By: Johan Nyström

Johan Nyström — Mon, 28 Jun 2010 06:43:29 +0000

Thanks for posting this. FYI, List.partialMap has now been renamed to List.collect.

By: Joakim Back

Joakim Back — Mon, 25 Jan 2010 11:35:18 +0000

#Jan K
Beautiful solution, I’ve written that isInstanceOf, asInstanceOf chain more than once.

#Paolo Losi
Looks like an excellent reason to bookmark the nightly builds documentation until 2.8 is released!

http://www.scala-lang.org/archives/downloads/distrib/files/nightly/docs/library/index.html

By: Jan Kronquist

Jan Kronquist — Mon, 25 Jan 2010 10:06:34 +0000

#Anders: Not really, as it doesn’t work if the list contains mixed types. In my example I had both Int, Float and String. You still have to do the filtering, otherwise you might get surprises in runtime. But of course, that is what dynamic programming is all about

By: Jan Kronquist

Jan Kronquist — Mon, 25 Jan 2010 10:01:55 +0000

#Paolo Losi: Thanks! This was exactly what I was looking for!

By: Anders Janmyr

Anders Janmyr — Mon, 25 Jan 2010 08:02:38 +0000

Yet, another reason to go dynamic. Apart from the unbelievably boring chore of waiting for the compiler it saves us from fighting with the type checker! # Ruby code >> res = %w(anders, peter kalle) => ["anders,", "peter", "kalle"] >> res.each { |x |puts x.length } 7 5 5 => ["anders,", "peter", "kalle"] Pure Bliss!

By: Paolo Losi

Paolo Losi — Sun, 24 Jan 2010 21:56:43 +0000

in scala 2.8 you can easily “refine” the type of your list.

scala> List(1,2,”paolo”,”losi”).partialMap({case s:String => s})
res2: List[String] = List(paolo, losi)

Note that the result is of type List[String] and not List[Any].
this solve the state problem, right?