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# Get YouTube ID from various YouTube URL
# Ruby port from JavaScript version: https://gist.github.com/takien/4077195/

def get_youtube_id(url)
  id = ''
  url = url.gsub(/(>|<)/i,'').split(/(vi\/|v=|\/v\/|youtu\.be\/|\/embed\/)/)
  if url[2] != nil
    id = url[2].split(/[^0-9a-z_\-]/i)
    id = id[0];
  else

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OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

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<VirtualHost *:80>
	# The ServerName directive sets the request scheme, hostname and port that
	# the server uses to identify itself. This is used when creating
	# redirection URLs. In the context of virtual hosts, the ServerName
	# specifies what hostname must appear in the request's Host: header to
	# match this virtual host. For the default virtual host (this file) this
	# value is not decisive as it is used as a last resort host regardless.
	# However, you must set it for any further virtual host explicitly.
	#ServerName www.example.com

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Encoding Video

Installing

Install FFmpeg with homebrew. You'll need to install it with a couple flags for webm and the AAC audio codec.

brew install ffmpeg --with-libvpx --with-libvorbis --with-fdk-aac --with-opus

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- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
  ...
  ...
  ...

  RCTRootView *rootView = [[RCTRootView alloc] initWithBundleURL:jsCodeLocation
                                                      moduleName:@"MyAwesomeApp"
                                               initialProperties:@{}
                                                   launchOptions:launchOptions];

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3rd-party API as data source (Ruby)

Get data from Stripe API and calculates MRR (Monthly Recurring Revenue) for every customer. Each customer could have one or more subscriptions. A subscription could be monthly or yearly, also it could have a discount (percent or fixed amount). Also the data source could return with not paid subscriptions (delinquency)

require "stripe"
require "terminal-table"

class Metrics

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Database sync, using data streams (JavaScript)

This is a simple AWS Lambda function to syncronize data from DynamoDB to ElasticSearch, it is triggered via DynamoDB streams. Also transforms data types.

const fetch = require('node-fetch');
const es_url = "https://elasticsearch.us-east-1.es.amazonaws.com";

exports.handler = async (event) => {

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Calculate most used hashtags (JavaScript)

AWS Lambda function to calculate most used hashtags from an Instagram account. The Instagram posts are stored in a DynamoDB table.

var doc = require('dynamodb-doc');
var dynamo = new doc.DynamoDB();
var mapreduce = require('mapred')(1);

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Ruby on Rails API authorization via JWT

ApplicationController that defines methods to authorize requests based on JWT, also defines Error handling

class ApplicationController < ActionController::API
  before_action :authenticate
  before_action :set_current_user_refs
  before_action :authorize

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JavaScript testing

Unit testing for Node.js / Redux using Jest

// State Management
const createStore = require('redux').createStore;
const applyMiddleware = require('redux').applyMiddleware;
const thunk = require('redux-thunk').default;
const reducers = require('../reducers');