crudh

Advanced Functional Programming with Scala - Notes

Copyright © 2017 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

crudh

#Use at your own risk. No warranties expressed or implied. YMMV. Drive responsibly. Eat healthy.

#for ZSH, I typically put these in my .zshrc
function restart_audio() {
  command sudo killall coreaudiod &&
  sudo launchctl unload /System/Library/LaunchDaemons/com.apple.audio.coreaudiod.plist &&
  sudo launchctl load /System/Library/LaunchDaemons/com.apple.audio.coreaudiod.plist &&
  echo 'Audio daemon restarted'
}

crudh

PS1='\[\e[0;33m\]\h:\W \u\$\[\e[m\] '
export CLICOLOR=1
export LSCOLORS=gxBxhxDxfxhxhxhxhxcxcx

export LC_MESSAGES="en_US.UTF-8"

alias mv='mv -i'
alias rm='rm -i'
alias cp='cp -i'
alias ls='ls -GF'

crudh

Keybase proof

I hereby claim:

• I am crudh on github.
• I am crudh (https://keybase.io/crudh) on keybase.
• I have a public key whose fingerprint is 0D56 584D FE63 CAC7 FDCC 054F 2E1B 5E5D 4404 227C

To claim this, I am signing this object:

crudh

public class MyPayloadEventDispatcher implements IEventDispatcher {

  @Override
  public void dispatchEvent(Object sink, IEvent event, Component component) {
    // Check that the payload isn't null and that the sink, the receiver, has the annotation
    if (event.getPayload() != null && sink.getClass().isAnnotationPresent(EventPayloadReceiver.class)) {
      EventPayloadReceiver eventReceiver = sink.getClass().getAnnotation(EventPayloadReceiver.class);

      // Check that the annotation is configured with the current event
      if (Arrays.asList(eventReceiver.value()).contains(event.getPayload().getClass())) {

crudh

def rss = Action { implicit request =>
  Ok(
    <rss version="2.0">
      <channel>
        <title>News Application</title>
        <link>{ routes.Application.index.absoluteURL(false) }</link>
        <description>News Application</description>
        { NewsArticle.all.map { newsArticle =>
          <item>
            <title>{ newsArticle.title }</title>

crudh

import java.util.Enumeration;
import java.util.List;

import com.tangosol.coherence.component.net.Member;
import com.tangosol.net.CacheFactory;
import com.tangosol.net.CacheService;
import com.tangosol.net.Cluster;
import com.tangosol.net.NamedCache;
import com.tangosol.net.Service;

crudh

grep -IUrl $'\r' .

crudh

[core]
    pager = less -+S
[push]
    default = current
[color]
    ui = auto
[color "branch"]
    current = yellow reverse
    local = yellow
    remote = green

crudh

#!/bin/sh

# CONFIGURE THIS
outputBase=/Users/crudh/Code/shell-scripts/mongo-backup/test
resultPrefix=system-name
mailSubject="Backup - mongodb"
mailBody="Backup - mongodb"
mailRecipient=christian@primian.se

# DO NOT CHANGE BELOW HERE--------------------------