orodio

Intro

Event Sourcing

James Hunter

• Twitter: @cccc00
• GitHub: orodio

orodio

var arr1 = [1, 2, 3, 4, 5];
var arr2 = ["one", "two", "three", "four", "five"];

map
[a] -> (a -> b) -> [b]

function double (v) { return v + v }

var a = arr1.map(double)
// a === [2, 4, 6, 8, 10]

orodio

__git_ps1 () {
  local b="$(git symbolic-ref HEAD 2>/dev/null)";
  if [ -n "$b" ]; then
    printf " (%s)" "${b##refs/heads/}";
  fi
}

PS1="\[\033[0;35m\]\$(__git_ps1)\[\033[0m\] \[\033[0;33m\]\W\[\033[0m\] \$ "

orodio

defmodule BankAccount do
  def start do
    await
  end

  def await, do: await([])
  def await events do
    receive do
      event = { :deposit, _amount }   -> events = [ event | events ]
      event = { :withdraw, _amount }  -> events = [ event | events ]

orodio

Beep Boop

$ npm install # install dependencies
$ npm test    # run tests
$ npm start   # run commands in commands.txt

Toy Robot Simulator

orodio

function digitalRoot (n) {
  return n === 0 ? 0 : 1 + ((n - 1) % 9)
}

function sum (a,b) { return a + b }

function luhn (x) {
  return String(x)
    .trim()
    .split("")

orodio

function tokenize(input) {
  return input
    .replace(/[\(]/g, ' ( ')
    .replace(/[\)]/g, ' ) ')
    .trim()
    .split(/\s+/);
}

function nest(input=[], list=[]) {
  let token = input.shift()

orodio

function value (line) {
  const [, t, c, v] = line.split(" ")
  return {t, p: {cursor: c.split("::"), value: v}}
}

function header (line) {
  const [,...rest] = line.split(" ")
  const c = rest.join(" ")
  return {t: "header", c}
}

orodio

import { shape, str, num, bool } from "facts"

shape(thingToCheck, {
  foo: str,
  bar: num, 
  rawr: {
    name: str,
    age:  num,
    alive: bool
  }

orodio

app_1      | [ 'save',
app_1      |   'lrem',
app_1      |   'auth',
app_1      |   'append',
app_1      |   'psetex',
app_1      |   'shutdown',
app_1      |   'sync',
app_1      |   'blpop',
app_1      |   'dbsize',
app_1      |   'rpop',