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Applied Functional Programming with Scala - Notes

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

Maven Cheat Sheet

My collection of useful hints and snippets for Apache Maven.

POM - Project Object Model

See http://maven.apache.org/pom.html

Export from evernote

You’ll have to open up the evernote application on either Mac or Windows (they don’t have a linux client), right click on the notebook you want to export, and select “Export.” Select the option to export to html (either one page or several pages, depending on your preference. I went with one html page for each note).

Clean filenames

How to use Hexo and deploy to GitHub Pages

1. Install Hexo

$ sudo npm install -g hexo-cli

$ hexo -v
hexo-cli: 0.1.9

Haskell, Stack and Intellij IDEA IDE setup tutorial how to get started

Upon completion you will have a sane, productive Haskell environment adhering to best practices.

Basics

Haskell is a programming language.
Stack is tool for Haskell projects. (similar tools for other languages include Maven, Gradle, npm, RubyGems etc)
Intellij IDEA IDE is a popular IDE.

Install required libraries

sudo apt-get install libtinfo-dev libghc-zlib-dev libghc-zlib-bindings-dev

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

	<?xml version="1.0" encoding="UTF-8"?>
	<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
	<plist version="1.0">
	<dict>
	<key>PayloadContent</key>
	<array>
	<dict>
	<key>PayloadContent</key>
	<dict>
	<key>com.google.Chrome</key>

	@echo off

	if "%1"=="" goto blank

	echo Squashing %1 commits...
	git reset --soft HEAD~%1
	git log --format=%%B%%n --reverse "HEAD@{1}" -n %1 > _msg.txt
	git commit -t _msg.txt
	del _msg.txt
	echo Done!

	/**
	* Single-file play framework application! Make sure everything
	* works, as this is the test case that un-earthed #371
	*/
	load.ivy("com.typesafe.play" %% "play" % "2.5.0")
	load.ivy("com.typesafe.play" %% "play-netty-server" % "2.5.0")
	load.ivy("org.scalaj" %% "scalaj-http" % "2.2.1")

	@

	import scala.annotation.unchecked.uncheckedVariance

	object Trial2712 {
	trait NotUsed
	import language.higherKinds

	/*
	* The following are simplified versions of FlowOps / FlowOpsMat and their
	* concrete subtypes.
	*/