propensive’s gists

propensive / quaternions.scala

Created August 1, 2012 02:01

Quaternions in Scala

	object Algebra {

	// Build up increasingly complex algebras
	trait Magma[T] {
	def add(x : T, y : T) : T
	}

	trait Monoid[T] extends Magma[T] {
	def zero : T
	}

propensive / dbsample.scala

Created August 2, 2012 19:01

Rapture ORM sample code

	import rapture.orm._

	object TestDb extends App {

	// Create a database pool
	val DbPool = new PostgresDbPool("localhost", "conferencedb", "operator", "letmein")

	// Define the database schema
	implicit object Conference extends Table(new Conference) {
	def allActive()(implicit db : Db) = selectFrom("WHERE active").all()

propensive / json.scala

Created November 26, 2012 14:53

Rapture I/O JSON extraction example

propensive / async.scala

Created June 12, 2013 20:05

Comparison of Rapture I/O JSON extraction using a for comprehension, and using Scala Async.

	import rapture.io._
	import scala.async._
	import Async._
	import scala.concurrent._
	import ExecutionContext.Implicits.global
	import strategy.returnFutures
	implicit val encoding = Encodings.`UTF-8`

	val forStyle = for {
	src <- (Http / "rapture.io" / "example.json").slurp[Char]

propensive / extraction.scala

Last active July 26, 2017 15:06

Example of automatic case class extraction from JSON using Rapture JSON 0.9.2

	Welcome to Scala version 2.10.2 (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_24).
	Type in expressions to have them evaluated.
	Type :help for more information.

	scala> import rapture.core._
	import rapture.core._

	scala> import rapture.json._
	import rapture.json._

propensive / Timezone craziness

Created May 12, 2014 10:51

	Welcome to Scala version 2.10.4 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0_51).
	Type in expressions to have them evaluated.
	Type :help for more information.

	scala> System.getProperty("user.timezone")
	res0: String = ""

	scala> new java.util.Date()
	res1: java.util.Date = Mon May 12 12:49:35 CEST 2014

propensive / matching.scala

Created July 24, 2014 00:25

Configurable JSON pattern matching in Rapture JSON 0.10

	Welcome to Scala version 2.10.4 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0_51).
	Type in expressions to have them evaluated.
	Type :help for more information.

	scala> import rapture.core._; import rapture.data._; import rapture.json._
	import rapture.core._
	import rapture.data._
	import rapture.json._

	scala> import jsonBackends.scalaJson._

propensive / formatters.scala

Created August 2, 2014 14:43

Custom formatters in Rapture JSON

	scala> import formatters.humanReadable
	import formatters.humanReadable

	scala> Json.format(json"""{ "foo": ["bar", "baz", 42] }""")
	res0: String =
	{
	"foo": [
	"bar",
	"baz",
	42

propensive / repl.scala

Created November 17, 2014 08:41

Compile-time JSON syntax checking in Rapture JSON

	Welcome to Scala version 2.10.4 (OpenJDK 64-Bit Server VM, Java 1.6.0_27).
	Type in expressions to have them evaluated.
	Type :help for more information.

	scala> import rapture.json._
	import rapture.json._

	scala> import jsonBackends.scalaJson._
	import jsonBackends.scalaJson._

propensive / diagnostics.repl

Created November 25, 2014 14:04

Better compile-time diagnostics when attempting to extract case classes from JSON

	scala> case class Bar(file: java.io.File) // We can't extract a File
	defined class Bar

	scala> case class Foo(bar: Bar) // therefore we can't extract a Bar
	defined class Foo

	scala> json""{ "bar": { "file": "..." } }""".as[Foo]
	Could not generate a Json extractor for case class Bar because a Json extractor for parameter `file' of type java.io.File could not be found
	Could not generate a Json extractor for case class Foo because a Json extractor for parameter `bar' of type Bar could not be found
	<console>:21: error: cannot extract type Foo from rapture.json.Json.

Jon Pretty propensive