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

martijnvermaat

Installation of NixOS with encrypted root

These are my notes on instaling NixOS 16.03 on a Lenovo ThinkPad X1 Carbon (4th generation) with an encrypted root file system using UEFI.

Most of this is scrambled from the following pages:

• Encrypted Root on NixOS - Nix Wiki
• Installing NixOS - Chris Martin
• Linux administration and use - Earl Douglas
• Installing NixOS on a ThinkPad W540 with encrypted root - Bluish Coder

ryancdotorg

#!/usr/bin/env python
  
import random
import struct
import sys

# Most of the Fat32 class was cribbed from https://gist.github.com/jonte/4577833
  
def ppNum(num):
  return "%s (%s)" % (hex(num), num)

rehno-lindeque

Setup NixOS (Virtualized + Haskell + Gnome3 + XMonad)

Before you get started

This is pretty out of date now... you may want to look elsewhere

Newer guides than mine (mine is a bit dated and has a lot of rough edges):

• NixOS on MacBook Pro

Have you looked at these?

d6y

Spacecmacs, VIM editor plus a crapton of plugins for Scala

Useful:

• https://github.com/syl20bnr/spacemacs/blob/master/doc/DOCUMENTATION.md
• http://thume.ca/howto/2015/03/07/configuring-spacemacs-a-tutorial/

One Time Set Up

vmarquez

  object Test {   
    import scalaz.{Lens,State}   
    case class BlahConfig(server: Int, l: List[Int]) 
     
    def doStuff(i: Int) = State[BlahConfig,Int]( c => (c.copy(l = i :: c.l), c.server) ) 
   
    case class FooConfig(val password: String) 
   
    def doSomeStuff(i: Int) = State[FooConfig, String](c =>(c, c.password)) 
    

vmarcinko

import kafka.server.KafkaConfig;
import kafka.server.KafkaServer;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Properties;

yantonov

How to install GHC from source + latest stack + cabal + cabal-install on ubuntu

for your convinience this instuction is available as:
gist
git repo

preferred way install stack than install ghc

stack (package manager and build tool, preferrered way to manage dependencies)

# settings

i-e-b

My experiments with an XMonad setup in NixOS. This is my work box now, so it pretty much works.

probably needs:

# useradd -m iain
# passwd iain ...
# passwd root ...

patriknw

/**
 * Copyright (C) 2009-2014 Typesafe Inc. <http://www.typesafe.com>
 */
package akka.contrib.mailbox

import scala.concurrent.duration._
import java.util.concurrent.atomic.AtomicInteger
import java.util.concurrent.atomic.AtomicLong
import com.typesafe.config.Config
import akka.actor.{ ActorContext, ActorRef, ActorSystem, ExtendedActorSystem }