JohnMurray

package trees


object Main extends App {

  trait Node 
  case class  InnerTreeNode ( left:Node, right:Node, value:Int ) extends Node
  case object StopNode extends Node 

  def leaf(x: Int): Node = InnerTreeNode(StopNode, StopNode, x)

JohnMurray

import sbt._
import sbt.Keys._

object MyPlugin extends AutoPlugin {
  override lazy val projectSettings: Seq[Setting[_]] = Seq(
    resourceDirectory in Compile  := file("/tmp")
  )
}

object MyBuild extends Build {

JohnMurray

for (int i = 0; i < 10_000; i++) {
  Thread t = new Thread(() -> System.out.println("doing something"));
  t.start();
  t.join();
}

// Eventually throws java.lang.OutOfMemoryError: unable to create new native thread

JohnMurray

extern crate iron;
extern crate mysql;

use iron::prelude::*;
use iron::status;
use iron::{Handler};

struct Router {
  routes: HashMap<String, Box<Handler>>
}

JohnMurray

package object mail {

  implicit def stringToSeq(single: String): Seq[String] = Seq(single)
  implicit def liftToOption[T](t: T): Option[T] = Some(t)

  sealed abstract class MailType
  case object Plain extends MailType
  case object Rich extends MailType
  case object MultiPart extends MailType

JohnMurray

Installing Go

Installation

Change Directory

cd ${HOME}

Install a binary distribution

JohnMurray

Ping Pong

A big reason people love Go is the concurrency primitives. Let's try them out with a coding challenge.

Goal

Launch 2 go-routines that send messages to each other over a channel. One go-routine will send "Ping" and the other will send "Pong." Each go-routine can only respond after they've received a message from the other go-routine. The exception is that the go-routine sending "Ping" can send an initial message

JohnMurray

Web Server

Another strong component of Go is the standard library. It is structured much like the Unix/Linux operating system. There are lots of small components that can be combined together for more complex tasks. There are also indespensible, modern primitives such as the ability to create a networking server.

Goal

Create a web-server that exposes a typical AppNexus "status" endpoint. The web-server will support

JohnMurray

#include <google/protobuf/arena.h>
using namespace google::protobuf;

void main() {
    Arena arena;
    auto msg = Arena::CreateMessage<MyProto>(&arena);
    
    setup_myproto(msg);
    push_to_queue(msg);
}

JohnMurray

#include <google/protobuf/arena.h>
using namespace google::protobuf;

void main() {
    Arena arena;
    auto msg = Arena::CreateMessage<MyProto>(&arena);
    
    setup_myproto(msg, 1);
    push_to_queue(msg);