jehrhardt

Keybase proof

I hereby claim:

• I am jehrhardt on github.
• I am jehrhardt (https://keybase.io/jehrhardt) on keybase.
• I have a public key ASBvdwoxc5ofY02pksHEurtNDEioiS9KrIJFCqqhURunkwo

To claim this, I am signing this object:

jehrhardt

(s/def ::bar (s/and int? even? #(> % 1000)))
(s/def ::foo (s/keys :req [::bar]))

(s/valid? ::foo {:bar 10000})

jehrhardt

case class Foo(bar: Int)

jehrhardt

Setup Mac OS X

Basic instructions on setting up my Mac.

Download and install Java and Virtual Box from Oracle:

• Java SE 8
• Virtual Box

Install Homebrew

jehrhardt

#! /usr/bin/env bash

# Setup:
# 1. Install latest Java and Virtual Box
# 2. Install Homebrew:
#    ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
# 3. run script
#    curl -L https://gist.githubusercontent.com/jehrhardt/d5d7e364e12e283c8949/raw/install_defaults.sh | sh

# Install Emacs via Homebrew

jehrhardt

akka

Basic introduction into the akka framework.

SBT dependency

Declare akka dependency in build.sbt

"com.typesafe.akka" %% "akka-actor" % "2.3.12"

jehrhardt

Futures

Dealing with Scala's futures.

Basics

Futures integrate well into the language. We know how to create an Option and Futures should work the same.

import scala.concurrent._

Some(1)

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try

Introduction to Try and IO with Scala.

Repeat Either

Either can be used for errors, but requires convention.

case class BlogNotFoundException(message: String) extends Exception(message)

jehrhardt

Errors

Dealing with errors in Scala.

for comprehension

Simple foreach

type Blog = Int
type BlogArticle = Int

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objects

Objects, classes, traits and case classes

Basics on classes

Use the keyword class

class Foo

val foo = new Foo