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View Applied-FP-with-Scala.md

Applied Functional Programming with Scala - Notes

Copyright © 2016-2018 Fantasyland Institute of Learning. All rights reserved.

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
@shankarshastri
shankarshastri / gist:4d496958d7d0b06f568ee043f2637ab4
Created Jan 2, 2020 — forked from cvogt/gist:9193220
Slick: Dynamic query conditions using the **MaybeFilter** (Updated to support nullable columns)
View gist:4d496958d7d0b06f568ee043f2637ab4
import scala.slick.lifted.CanBeQueryCondition
// optionally filter on a column with a supplied predicate
case class MaybeFilter[X, Y](val query: scala.slick.lifted.Query[X, Y]) {
def filter[T,R:CanBeQueryCondition](data: Option[T])(f: T => X => R) = {
data.map(v => MaybeFilter(query.filter(f(v)))).getOrElse(this)
}
}
// example use case
import java.sql.Date
View thread-pools.md

Thread Pools

Thread pools on the JVM should usually be divided into the following three categories:

  1. CPU-bound
  2. Blocking IO
  3. Non-blocking IO polling

Each of these categories has a different optimal configuration and usage pattern.

@shankarshastri
shankarshastri / ScalaPbSerializer.scala
Created Aug 30, 2019 — forked from thesamet/ScalaPbSerializer.scala
Akka serializer for ScalaPB messages
View ScalaPbSerializer.scala
package protoser
import java.util.concurrent.atomic.AtomicReference
import akka.actor.ExtendedActorSystem
import akka.serialization.BaseSerializer
import com.trueaccord.scalapb.GeneratedMessageCompanion
class ScalaPbSerializer(val system: ExtendedActorSystem) extends BaseSerializer {
private val classToCompanionMapRef = new AtomicReference[Map[Class[_], GeneratedMessageCompanion[_]]](Map.empty)
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