Jan Christopher Vogt cvogt

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

This re-styles your sublime text sidebar to be dark, it fits default Monokai theme.

Save the Default.sublime-theme file into packages/Theme - Default, make a backup of your original if you want to be able to go back easily.

Based on:

	# Configuring DNS-over-TLS on macOS
	# Worked on macOS 10.13.4
	brew -v update
	brew -v doctor
	# Next two commands are optional
	sudo chown -R $(whoami) $(brew --prefix)/*
	echo 'export PATH="/usr/local/sbin:$PATH"' >> ~/.bash_profile
	# Install DNS client
	brew install knot-resolver
	# Should be installed to something like: /usr/local/Cellar/knot-resolver/2.3.0/sbin/kresd

	#!/usr/bin/env python2.7
	# https://gist.github.com/cvogt/1e46597e39bfe0e0aee8d5348123ca03
	# based on https://gist.github.com/alexeygrigorev/a1bc540925054b71e1a7268e50ad55cd#file-vimeo-download-py
	# also see https://github.com/eMBee/vimeo-download

	import requests
	import base64
	import sys
	from tqdm import tqdm

	package com.pretend.myforklift

	import com.liyaos.forklift.slick.{ SlickCodegen, SlickMigrationCommandLineTool, SlickMigrationCommands, SlickMigrationManager }

	import scala.io.StdIn

	trait MyMigrationCommands extends SlickMigrationCommands
	with MyMigrationFilesHandler {
	this: SlickMigrationManager with SlickCodegen =>

	% sbtx dependencyGraph
	... blah blah ...
	[info] * Welcome to the sbt build definition for Scala! *
	[info] Check README.md for more information.
	[error] Not a valid command: dependencyGraph
	[error] Not a valid project ID: dependencyGraph


	% sbtx -Dplugins=graph dependencyGraph
	... blah blah ...

	import org.specs2._
	import execute._
	import specification._
	import core._

	class TestSuite(tests: Fragment*) extends Specification {
	def is = br ^ Fragments.foreach(tests)(f => Fragments(f, br))
	}

	object TestSuite {

	import Predef.{any2stringadd => _,_}

	// GUESS THE INFERRED TYPE FOR ys!
	class :=[T,Q]
	object := {
	/** Ignore default */
	implicit def useProvided[P, D] : P := D = new (P := D)
	/** Infer type argument to default */
	implicit def useDefault[D] : D := D = new (D := D)
	}

	package com.sport195.api

	import play.api.libs.json._
	import scala.language.experimental.macros

	object ImplicitConversions {
	import java.sql.Timestamp
	import java.sql.Date

	implicit val x = scala.language.implicitConversions

	brew update
	brew versions FORMULA
	cd `brew --prefix`
	git checkout HASH Library/Formula/FORMULA.rb # use output of "brew versions"
	brew install FORMULA
	brew switch FORMULA VERSION
	git checkout -- Library/Formula/FORMULA.rb # reset formula

	## Example: Using Subversion 1.6.17
	#