alvinkatojr

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

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This tutorial as a series of videos

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.

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alvinkatojr

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h):

• -E: will describe the underlaying queries of the \ commands (cool for learning!)
• -l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

alvinkatojr

# Copyright Musab Kilic 2018
# Special thanks to Noam Nisan and Shimon Schocken
# Course page: https://www.coursera.org/learn/build-a-computer/
#
# Usage:   python submit.py [folder(0-6)/full]
# Example: python submit.py 0
#          python submit.py full

from __future__ import division
import os

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# On slow systems, checking the cached .zcompdump file to see if it must be 
# regenerated adds a noticable delay to zsh startup.  This little hack restricts 
# it to once a day.  It should be pasted into your own completion file.
#
# The globbing is a little complicated here:
# - '#q' is an explicit glob qualifier that makes globbing work within zsh's [[ ]] construct.
# - 'N' makes the glob pattern evaluate to nothing when it doesn't match (rather than throw a globbing error)
# - '.' matches "regular files"
# - 'mh+24' matches files (or directories or whatever) that are older than 24 hours.
autoload -Uz compinit 

alvinkatojr

var elements = Array.from(document.querySelectorAll('.js-link-block'))
elements.map(function (element) {
  var nameElement = element.querySelector('.chartlist-name')
  return nameElement && nameElement.textContent.replace(/\s+/g, ' ').trim()
}).forEach(function (name, i, names) {
  if (name !== names[i + 1]) return
  var deleteButton = elements[i].querySelector('[data-ajax-form-sets-state="deleted"]')
  if (deleteButton) deleteButton.click()
  location.reload()
})

alvinkatojr

Tutorial: Designing a GraphQL API

This tutorial was created by Shopify for internal purposes. We've created a public version of it since we think it's useful to anyone creating a GraphQL API.

It's based on lessons learned from creating and evolving production schemas at Shopify over almost 3 years. The tutorial has evolved and will continue to change in the future so nothing is set in stone.

alvinkatojr

require 'rbnacl'
require 'base64'
class Example

  attr_reader :secret_box, :index_key

  def initialize
    key = RbNaCl::Random.random_bytes(RbNaCl::SecretBox.key_bytes)
    @index_key = RbNaCl::Random.random_bytes(RbNaCl::SecretBox.key_bytes)
    @secret_box = RbNaCl::SecretBox.new(key)

alvinkatojr

# Author: Pieter Noordhuis
# Description: Simple demo to showcase Redis PubSub with EventMachine
#
# Update 7 Oct 2010:
# - This example does *not* appear to work with Chrome >=6.0. Apparently,
#   the WebSocket protocol implementation in the cramp gem does not work
#   well with Chrome's (newer) WebSocket implementation.
#
# Requirements:
# - rubygems: eventmachine, thin, cramp, sinatra, yajl-ruby

alvinkatojr

// the interface 
var utils = {
  addListener: null,
  removeListener: null 
};

// the implementation
if (typeof window.addEventListener === 'function') {
  utils.addListener = function (el, type, fn) {
    el.addEventListener(type, fn, false);

alvinkatojr

Warden::Manager.serialize_into_session{|user| user.id }
Warden::Manager.serialize_from_session{|id| User.get(id) }
 
Warden::Manager.before_failure do |env,opts|
  # Sinatra is very sensitive to the request method
  # since authentication could fail on any type of method, we need
  # to set it for the failure app so it is routed to the correct block
  env['REQUEST_METHOD'] = "POST"
end