SethTisue

scala> import scala.language.reflectiveCalls
import scala.language.reflectiveCalls

scala> type Structural = { def foo: Int; def foo_=(x: Int): Unit }
defined type alias Structural

scala> object O { var foo = 5 }
defined object O

scala> (O: Any).asInstanceOf[Structural].foo = 10

SethTisue

Scalawags #38: The Sound of Dotty

YouTube link: https://www.youtube.com/watch?v=e687bFp2FT4

Our guest is Martin Odersky, the creator of Scala. We invited him on specifically to discuss Dotty, a new compiler for Scala.

Your hosts this episode: Josh Suereth,

SethTisue

Scalawags #37: Holiday Special 2015/6

YouTube link: https://www.youtube.com/watch?v=BYm634_OfTk

We review the amazing year of 2015 and make predictions for 2016, as well as read off and discuss some user predictions.

Your hosts this episode: Josh Suereth, Dick Wall, Heather Miller,

SethTisue

Welcome to Scala version 2.11.7 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_66).

scala> implicit class Foo(val x: Int) { def foo = x * 2 }
defined class Foo

scala> 3.x
res0: Int = 3

scala> :reset
Resetting interpreter state.

SethTisue

# repo is https://github.com/SethTisue/Project-Euler

% sbt
[info] Loading global plugins from /Users/tisue/.sbt/0.13/plugins
[info] Updating {file:/Users/tisue/.sbt/0.13/plugins/}global-plugins...
[info] Resolving org.fusesource.jansi#jansi;1.4 ...
[info] Done updating.
[info] Loading project definition from /Users/tisue/euler/project
[info] Updating {file:/Users/tisue/euler/project/}euler-build...
[info] Resolving org.fusesource.jansi#jansi;1.4 ...

SethTisue

Scalawags #36: Standards and Platforms

The "collections" part of the original episode name will be covered once we have Josh back.

YouTube link: https://www.youtube.com/watch?v=qkTptEosN-o

Your hosts this episode: Dick Wall, Daniel Spiewak,

SethTisue

Scalawags #35: What’s in a Standard, Anyway?

YouTube link: https://www.youtube.com/watch?v=RmezAWtGmWg

Your hosts: Josh Suereth, Dick Wall, Seth Tisue

Join us during and between episodes for web-based Scalawags chat on Gitter.

Intro (0:00)

SethTisue

scala> def one = { println("hey!"); 1 }
one: Int

scala> val endlessParadeOfOnes = Stream.continually(one)
hey!
endlessParadeOfOnes: scala.collection.immutable.Stream[Int] = Stream(1, ?)

scala> endlessParadeOfOnes.take(5).sum
hey!
hey!

SethTisue

Ichoran
Anyway, point being that all lazy vals have a bit of performance overhead, local and nonlocal. Hand-coding will generally be better if you can keep everything on the stack.

viktorklang Oct 12 19:32
IMHO lazy val should be non-thread safe and @volatile lazy val should be thread safe...

Ichoran Oct 12 19:40
@viktorklang - Yeah, that'd be nice. Or at least allow a @nonvolatile annotation to opt-in to the thread-unsafe version.

SethTisue

Trait with superaccessor

here's T.scala:

trait T1 {
  def x = 3
}
trait T2 extends T1 {
  override def x = super.x + 1

}