ezhulenev

import scala.collection.immutable.TreeMap

trait ToTreeMap[A] {
  type Result

  def treeMap(x: A): Result
}

trait LowerPriorityToTreeMap {
  implicit def plainMap[K, V](implicit ord: Ordering[K]): ToTreeMap[Map[K, V]] =

ezhulenev

12:20:53.549 [main] INFO  c.s.dynamics.DecisionTreeDynamics$ - Load Training data from: /Users/ezhulenev/data/NYSE/EQY_US_NYSE_BOOK_20130403. Filtered: AZ
12:20:53.677 [main] DEBUG c.s.dynamics.DecisionTreeDynamics$ - Training data set [1]:
12:20:53.686 [main] DEBUG c.s.dynamics.DecisionTreeDynamics$ -  - OpenBookFile(AZ,A,2013-04-03,/Users/ezhulenev/data/NYSE/EQY_US_NYSE_BOOK_20130403/openbookultraAZ_A20130403_1_of_1)
12:20:53.686 [main] INFO  c.s.dynamics.DecisionTreeDynamics$ - Load Validation data from: /Users/ezhulenev/data/NYSE/EQY_US_NYSE_BOOK_20130404. Filtered: AZ
12:20:53.687 [main] DEBUG c.s.dynamics.DecisionTreeDynamics$ - Validation data set [1]:
12:20:53.687 [main] DEBUG c.s.dynamics.DecisionTreeDynamics$ -  - OpenBookFile(AZ,A,2013-04-04,/Users/ezhulenev/data/NYSE/EQY_US_NYSE_BOOK_20130404/openbookultraAZ_A20130404_1_of_1)
12:20:53.699 [main] INFO  c.s.dynamics.ConfiguredSparkContext - Create spark context. Master: local[2]. App Name: OrderBookDynamics
12:20:55.330 [main] INFO  com.scalafi.dyna

ezhulenev

trait MyOption[A] {
  def fold[B](n: => B, s: A => B): B

  // Define the usual Option API.
  //
  // * Constructors (on the object)
  // some
  // none
  // * methods
  // map

ezhulenev

object ServerSparkContext {

  private[this] lazy val _sqlContext = {
    val conf = new SparkConf()
      .setAppName("....")
    val sc = new SparkContext(conf)

    // TODO: Bug in Spark: http://stackoverflow.com/questions/30323212
    val ctx = new HiveContext(sc)
    ctx.setConf("spark.sql.hive.convertMetastoreParquet", "false")

ezhulenev

{-# LANGUAGE FlexibleContexts           #-}
{-# LANGUAGE PolyKinds                  #-}
{-# LANGUAGE RankNTypes                 #-}
{-# LANGUAGE ScopedTypeVariables        #-}
{-# LANGUAGE DataKinds                  #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE MultiParamTypeClasses      #-}
{-# LANGUAGE RoleAnnotations            #-}
{-# LANGUAGE TypeFamilies               #-}
{-# LANGUAGE TypeOperators              #-}

ezhulenev

object InstantInsanity extends App {

  type Cube = Seq[Char]

  val cubes: Seq[Cube] = Seq("BGWGBR", "WGBWRR", "GWRBRR", "BRGGWW").map(_.toSeq)

  // Rotate a cube 90 degrees over its Z-axis, leaving up and down in place.
  def rot: Cube => Cube = { case Seq(u, f, r, b, l, d) => Seq(u, r, b, l, f, d) }

  // Twist a cube around the axis running from the upper-front-right

ezhulenev

object InstantInsanity extends App {

  // scalastyle:off

  def undefined[T]: T = ???
  def ⊥[T]: T = undefined

  trait R
  trait G
  trait B