Solid Scala

Transcript

1. Richard Dallaway @d6y www.underscoreconsulting.com

2. Agenda 1. Benefits of Scala 2. What it looks like

   3. Why we trust it 4. How to start

3. Benefits Productivity Maintainability Multi-core Developer Joy

4. Without giving up... Performance Curly Braces Java Investment Tooling (but...)

5. import org.joda.time.DateTime case class Subscription( owner: String, isTrial: Boolean, expiry:

   DateTime) val nextMonth = new DateTime().plusMonths(1) val sub = new Subscription( "Bob", isTrial = true, nextMonth) sub.owner // “Bob” sub == new Subscription( "Bob", true, nextMonth) // true

6. val subs = List( Subscription("Anna", true, new DateTime()), ... )

   val trials : List[Subscription] = subs.filter(s => s.isTrial) def expiring(sub: Subscription) : Boolean = daysBetween(now,sub.expiry).getDays < 2 val nagList = subs.filter(expiring) val expiringTrials = subs.filter(expiring).filter(_.isTrial)

7. case class Sub(name: String, cc: Option[String]) val subs = List(

   Sub("Anna", None), Sub("Bob", Some("1234-5678-9123-4567")) ) def bill(cc: String) : Result = ... val results = subs.flatMap(s => s.cc).map(bill) val results = for { sub <- subs cc <- sub.cc } yield bill(cc) .par

8. 2003 2006 2009 2008 2011 2004 2005 2010 2007 2012

   2013 2014 1.0 2.0 2.3 2.8 2.7 2.9 2.10 2.11 2.6 2.5 2.4 2.9.3 2.8.2

9. The guy who built javac SpringSource VMware An advisor

10. None

11. Ideas for starting 1. Small project trial 2. Mixed Java/Scala

    projects 3. For tests

12. @d6y @davegurnell @milessabin www.underscoreconsulting.com meetup.com/london-scala meetup.com/Functional-Brighton