jdegoes

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

aappddeevv

#The Problem We just described standard design issues you have when you start creating layers of services, DAOs and other components to implement an application. That blog/gist is here.

The goal is to think through some designs in order to develop something useful for an application.

#Working through Layers If you compose services and DAOs the normal way, you typically get imperative style objects. For example, imagine the following:

  object DomainObjects {

patriknw

/**
 *  Copyright (C) 2009-2013 Typesafe Inc. <http://www.typesafe.com>
 */

package akka.contrib.pattern

import language.postfixOps
import scala.concurrent.duration._
import com.typesafe.config.ConfigFactory
import akka.actor.Actor

wfaler

// simple example of the cake pattern

// abstract DAO trait
trait Repository[A, B]{
  // saves an entity, returns an ID
  def save(entity: A): B
  // more features..
}

trait RdbmsRepository extends Repository[MyUserCaseClass, Long]{

iros

Title

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• URL

  <The URL Structure (path only, no root url)>

• Method: