drstevens / IDEA run configuration

Last active December 31, 2015 21:39 — forked from mslinn/IDEA run configuration

-Dconfig.resource=test.conf -Dlogger.file=test/resources/logback-test.xml

drstevens / FutureUtil.scala

Created January 15, 2014 18:35 — forked from jlupien/FutureUtil.scala

	// Doesn't compile. Good.
	def futureInt(): Future[Int] = Future.value(Future.value(1))

	// Compiles. Not good. Caller cannot wait on completion of nested future.
	def futureUnit(): Future[Unit] = Future.value(Future.value(()))

	// Also compiles. Nice convenience, but not worth the cost of the issues
	// it might cause (as above), right?
	def futureUnit(): Future[Unit] = Future.value(1)

drstevens / FooSpec.scala

Created January 16, 2014 01:15

Attempt to use defaultReturn to automatically set up return values to methods on mock which the return instance of the mock. See my question to specs2-user mailing list - https://groups.google.com/forum/#!topic/specs2-users/My86VN-NT80

	//scala 2.10.2
	//"org.scalaz" %% "scalaz-core" % "7.0.3"
	//"org.specs2" %% "specs2" % "2.1.1" % "test"
	//"org.mockito" % "mockito-all" % "1.9.0" % "test"

	import scalaz.State._
	import org.specs2.mutable.Specification
	import org.specs2.mock._

	trait Builder {

drstevens / gist:9201268

Created February 25, 2014 02:03

Map.withDefaultValue is a bad idea

	Welcome to Scala version 2.10.3 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0_25).
	Type in expressions to have them evaluated.
	Type :help for more information.

	scala> val map0 = Map.empty[Int, Int] withDefaultValue 0
	map0: scala.collection.immutable.Map[Int,Int] = Map()

	scala> val map1 = map0 mapValues(identity)
	map1: scala.collection.immutable.Map[Int,Int] = Map()

drstevens / ApplicativeIdentityFail.scala

Created February 26, 2014 21:27

Applicative for play.api.libs.json.JsResult

	Welcome to Scala version 2.10.2 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0_25).
	Type in expressions to have them evaluated.
	Type :help for more information.

	scala> import play.api.libs.json._; import play.api.libs.functional.Applicative;
	import play.api.libs.json._
	import play.api.libs.functional.Applicative

	scala> val expected = JsSuccess(10, JsPath(List(KeyPathNode("somekey"))))
	expected: play.api.libs.json.JsSuccess[Int] = JsSuccess(10,/somekey)

drstevens / trampolined-state.scala

Last active August 29, 2015 14:02 — forked from travisbrown/trampolined-state.scala

Trampolining the state monad via applicative combinator appears to work

	import scalaz._, Scalaz._

	def setS(i: Int): State[List[Int], Unit] = modify(i :: _)

	val s = (1 to 10000).foldLeft(state[List[Int], Unit](()).lift[Free.Trampoline]) {
	case (st, i) => st *> setS(i).lift[Free.Trampoline]
	}

	s(Nil).run

drstevens / gist:2b6a9686881c1183ed55

Created September 18, 2014 18:31

Reduce boilerplate when not using primitives


	import scalaz.Id.Id
	import scalaz.BijectionT._
	import scalaz.Lens

	trait Bijectionz[A, C] {

	def apply(str: C): A
	def unapply(a: A): Option[C]

drstevens / gist:77db6bab6b1e995dac13

Created December 18, 2014 23:29

rough timing of alternate implementation of Rng.fill

	import com.nicta.rng.Rng
	import org.joda.time.DateTime
	import scalaz._
	import Scalaz._

	object Foo extends App {

	def time[A](f: => A): (Long, Long, Long) = {
	val t0 = System.currentTimeMillis
	val a = f

drstevens / gist:6e69d80eefda1ed1bb65

Last active August 29, 2015 14:18 — forked from debasishg/gist:b2bb9e12f9de6f601d86

	trait Writes[T] {
	def writes(o: T): JsValue
	}

	trait Reads[T] {
	def reads(json: JsValue): T
	}

	trait Format[T] extends Writes[T] with Reads[T]

drstevens / Advanced-FP-with-Scala.md

Created September 13, 2016 17:11 — forked from jdegoes/Applied-FP-with-Scala.md

Advanced Functional Programming with Scala - Notes

1. Mastering Functions

A function is a mapping from one set, called a domain, to another set, called the codomain. A function associates every element in the domain with exactly one element in the codomain. In Scala, both domain and codomain are types.

val square : Int => Int = x => x * x