djspiewak

Getting Started in Scala

This is my attempt to give Scala newcomers a quick-and-easy rundown to the prerequisite steps they need to a) try Scala, and b) get a standard project up and running on their machine. I'm not going to talk about the language at all; there are plenty of better resources a google search away. This is just focused on the prerequisite tooling and machine setup. I will not be assuming you have any background in JVM languages. So if you're coming from Python, Ruby, JavaScript, Haskell, or anywhere…  I hope to present the information you need without assuming anything.

Disclaimer It has been over a decade since I was new to Scala, and when I was new to Scala, I was coming from a Java and Ruby background. This has probably caused me to unknowingly make some assumptions. Please feel free to call me out in comments/tweets!

One assumption I'm knowingly making is that you're on a Unix-like platform. Sorry, Windows users.

Getting the JVM

scottfrazer

Go vs. Scala (Akka) Concurrency

A comparison from 2 weeks using Go.

Actors vs. Functions

Akka's central principle is that there you have an ActorSystem which runs Actors. An Actor is defined as a class and it has a method to receive messages.

collinalexbell

(defn tree-to-list [tree root-id root-key]
  (flatten (cons
            (get tree root-id)
            (map
             (fn [filter-result]
               (tree-to-list
                tree
                (first filter-result)
                root-key))
             (filter-by-parent tree root-key root-id)))))

keith

sudo ln -s /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/10.0\ \(14A5309d\)
           /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport

asciimike

///
//  AppDelegate.swift
//  ZeroToApp
//

import UIKit
import Firebase
import FBSDKCoreKit

@UIApplicationMain

reyk

OpenBSD 5.9 (GENERIC.MP) #163: Wed Feb 17 22:48:13 CET 2016
   mike@esdenera.com:/usr/obj/sys/arch/amd64/compile/GENERIC.MP
real mem = 520028160 (495MB)
avail mem = 500105216 (476MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.3 @ 0xf8ec0 (216 entries)
bios0: vendor American Megatrends Inc. version "090006" date 05/23/2012
bios0: Microsoft Corporation Virtual Machine

kostiakoval

import UIKit
import XCPlayground

let a = 10


let layer = CAShapeLayer()
layer.strokeColor = UIColor.redColor().CGColor
layer.fillColor = UIColor(red: 1, green: 0.33, blue: 0.33, alpha: 1).CGColor
layer.lineWidth = 12

kharrison

// Swift Standard Librray - String
// Keith Harrison http://useyourloaf.com

// Import Foundation if you want to bridge to NSString
import Foundation

// ====
// Initializing a String
// ====

JaviLorbada

Videos

• Introduction to Functional Programming Johannes Weiß - https://vimeo.com/100786088
• ReactiveCocoa at MobiDevDay Andrew Sardone - https://vimeo.com/65637501
• The Future Of ReactiveCocoa Justin Spahr-Summers - https://www.youtube.com/watch?v=ICNjRS2X8WM
• Enemy of the State Justin Spahr-Summers - https://www.youtube.com/watch?v=7AqXBuJOJkY
• WWDC 2014 Session 229 - Advanced iOS Application Architecture and Patterns Andy Matuschak - https://developer.apple.com/videos/play/wwdc2014/229/
• Functioning as a Functionalist Andy Matuschak - https://www.youtube.com/watch?v=rJosPrqBqrA
• Controlling Complexity in Swift Andy Matuschak - https://realm.io/news/andy-matuschak-controlling-complexity/

bitemyapp

The Learning Haskell guide has been moved to a git repo to enable outside contribution

Find it here: https://github.com/bitemyapp/learnhaskell