bitwalker

FROM bitwalker/alpine-erlang:latest
MAINTAINER Paul Schoenfelder <paulschoenfelder@gmail.com>

ENV REFRESHED_AT=2016-06-21 \
    HOME=/opt/app/ \
    MIX_ENV=prod \
    TERM=xterm \
    APP=myapp \
    APPVER=0.1.0

bitwalker

defmodule Config do
  @moduledoc """
  This module handles fetching values from the config with some additional niceties
  """

  @doc """
  Fetches a value from the config, or from the environment if {:system, "VAR"}
  is provided.

  An optional default value can be provided if desired.

bitwalker

defmodule MyApp do
  use Application
  
  def start(_type, _args) do
    import Supervisor.Spec, warn: false
    
    :ok = handle_args!
    
    children = []
    Supervisor.start_link(children, strategy: :one_for_one, name: MyApp.Supervisor)

bitwalker

When should you use DateTime and when should you use Time?

It's a common misconception that [William Shakespeare][1] and [Miguel de Cervantes][2] died on the same day in history - so much so that UNESCO named April 23 as [World Book Day because of this fact][3]. However because England hadn't yet adopted [Gregorian Calendar Reform][4] (and wouldn't until [1752][5]) their deaths are actually 10 days apart. Since Ruby's Time class implements a [proleptic Gregorian calendar][6] and has no concept of calendar reform then there's no way to express this. This is where DateTime steps in:

>> shakespeare = DateTime.iso8601('1616-04-23', Date::ENGLAND)
=> Tue, 23 Apr 1616 00:00:00 +0000
>> cervantes = DateTime.iso8601('1616-04-23', Date::ITALY)
=> Sat, 23 Apr 1616 00:00:00 +0000

bitwalker

function withinRange(sourceLong, sourceLat, targetLong, targetLat, range) {
    var nauticalMilesPerStatuteMile = 0.868976;
    // Latitude is always the same distance. Divide degrees by 60 to get arcminutes
    var milesPerMinLat = 69.047 / 60;
    // Distance in miles per arcminute longitude depends on the cosine of the arcminutes of latitude
    var milesPerMinLong = (1 * Math.cos(sourceLat)) / nauticalMilesPerStatuteMile;
    // Get delta in minutes between source and target longitude, convert to statute miles
    var deltaLong = Math.abs((sourceLong * 60) - (targetLong * 60));
    // Convert `deltaLong` to statute miles, rounding to 2 decimal places
    var deltaLong = Math.round((milesPerMinLong * deltaLong) * 100) / 100;

bitwalker

/**
 * Extracts values from a string using a pattern mask.
 *
 * Example:
 *  var greetFormat = 'Hello {{name}}! My name is {{greeter}}!'
 *  extract(greetFormat, 'Hello Paul! My name is Robotron!') => { name: 'Paul', greeter: 'Robotron'}
 */
function extract(format, s) {
    var parser = getParser(format);
    var parsed = parser.mask.exec(s);

bitwalker

/**
 * Dead Center an element with display: inline-block
 */

html,
body { margin: 0; height: 100%; }

.container {
	letter-spacing: -0.31em;
	text-rendering: optimizespeed;

bitwalker

#!/bin/sh
# AUTHOR: Paul Schoenfelder
#
# This post-receive hook validates that committed files use proper (LF) line endings.

verify_lf()
{
    echo "Validating line endings..."
    oldrev=$(git rev-parse $1)
    newrev=$(git rev-parse $2)

bitwalker

import scala.util.parsing.combinator._

/**
 * This trait provides the mathematical operations which the calculator can perform.
 */
trait Maths {
  def add(x: Float, y: Float) = x + y
  def sub(x: Float, y: Float) = x - y
  def mul(x: Float, y: Float) = x * y
  def div(x: Float, y: Float) = if (y > 0) (x / y) else 0.0f

bitwalker

/** 
 * JavaScript Module Pattern Example with "Passive Attachment"
 */
(function (root, builder, undefined) {
    if (typeof define === 'function') {
        // CommonJS AMD
        define('MyModule', ['jQuery', 'DependencyA', 'DependencyB'], function($, a, b) {
            return builder(root, $, a, b, null);
        });
    }