Lucas Neves de Araujo LucasNevesAraujo

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

	let hasBlobConstructor = typeof(Blob) !== 'undefined' && (function () {
	try {
	return Boolean(new Blob());
	} catch (e) {
	return false;
	}
	}());

	let hasArrayBufferViewSupport = hasBlobConstructor && typeof(Uint8Array) !== 'undefined' && (function () {
	try {

	/* bling.js */
	window.$ = document.querySelector.bind(document);
	window.$$ = document.querySelectorAll.bind(document);
	Node.prototype.on = window.on = function(name, fn) { this.addEventListener(name, fn); };
	NodeList.prototype.__proto__ = Array.prototype;
	NodeList.prototype.on = function(name, fn) { this.forEach((elem) => elem.on(name, fn)); };

	# OSX for Hackers (Mavericks/Yosemite)
	#
	# Source: https://gist.github.com/brandonb927/3195465

	#!/bin/sh

	# Some things taken from here
	# https://github.com/mathiasbynens/dotfiles/blob/master/.osx

	# Ask for the administrator password upfront

	/**
	* Retrieves all the rows in the active spreadsheet that contain data and logs the
	* values for each row.
	* For more information on using the Spreadsheet API, see
	* https://developers.google.com/apps-script/service_spreadsheet
	*/
	function readRows() {
	var sheet = SpreadsheetApp.getActiveSheet();
	var rows = sheet.getDataRange();
	var numRows = rows.getNumRows();

	# -----------------------------------------------------------------
	# .gitignore for WordPress
	# Bare Minimum Git
	# http://ironco.de/bare-minimum-git/
	# ver 20150227
	#
	# This file is tailored for a WordPress project
	# using the default directory structure
	#
	# This file specifies intentionally untracked files to ignore

	<?php

	// (string) $message - message to be passed to Slack
	// (string) $room - room in which to write the message, too
	// (string) $icon - You can set up custom emoji icons to use with each message
	public static function slack($message, $room = "engineering", $icon = ":longbox:") {
	$room = ($room) ? $room : "engineering";
	$data = "payload=" . json_encode(array(
	"channel" => "#{$room}",
	"text" => $message,

	#! /usr/bin/env python2
	# Requires: PIL, colormath
	#
	# Improved algorithm now automatically crops the image and uses much
	# better color matching

	from PIL import Image, ImageChops
	from colormath.color_conversions import convert_color
	from colormath.color_objects import LabColor
	from colormath.color_objects import sRGBColor as RGBColor