jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

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.

---

justmoon

'use strict';

module.exports = function CustomError(message, extra) {
  Error.captureStackTrace(this, this.constructor);
  this.name = this.constructor.name;
  this.message = message;
  this.extra = extra;
};

require('util').inherits(module.exports, Error);

mshafrir

{
    "AL": "Alabama",
    "AK": "Alaska",
    "AS": "American Samoa",
    "AZ": "Arizona",
    "AR": "Arkansas",
    "CA": "California",
    "CO": "Colorado",
    "CT": "Connecticut",
    "DE": "Delaware",

pesterhazy

This gist lists challenges you run into when building offline-first applications based on IndexedDB, including open-source libraries like Firebase, pouchdb and AWS amplify (more).

Note that some of the following issues affect only Safari. Out of the major browsers, Chrome's IndexedDB implementation is the best.

Backing file on disk (WAL file) keeps growing (Safari)

When this bug occurs, every time you use the indexeddb, the WAL file grows. Garbage collection doesn't seem to be working, so after a while, you end up with gigabytes of data.

Random exceptions when working with a large number of indexeddb databases (Safari)

dhh

# autoload concerns
module YourApp
  class Application < Rails::Application
    config.autoload_paths += %W(
      #{config.root}/app/controllers/concerns
      #{config.root}/app/models/concerns
    )
  end
end

solarkraft

/*** Publishing: Hide things that aren't very useful for a read-only view */

/** Hide page properties (public pages will always have public: true) */
.content .pre-block { display: none; }

/** Title */
/* Make title non-editable */
#main-container .page-title { pointer-events: none; }

/** Hide useless sidebar stuff */

janko

require "active_record"

ActiveRecord::Base.establish_connection('postgres:///testing')
ActiveRecord::Migration.verbose = false

ActiveRecord::Migration.class_eval do
  create_table :played_quizzes, force: true do |t|
    t.integer :player_ids, array: true
    t.json    :quiz_snapshot
  end

kellyredding

require 'net/imap'

# Net::IMAP raises a parse error exception when fetching attributes it doesn't
# recognize.  Here I patch an instance of Net::IMAP's `msg_att` method to
# recognize the Gmail IMAP extended attributes

# Refer to:
# * https://developers.google.com/google-apps/gmail/imap_extensions#access_to_gmail_labels_x-gm-labels
# * http://blog.wojt.eu/post/13496746332/retrieving-gmail-thread-ids-with-ruby

j3j5

Adyen Test Card Numbers
These cards are only valid on our TEST system and they will never involve any actual transaction or transfer of funds. The TEST card numbers will not work on the Adyen LIVE Platform.

For all cards use the following expiration and CVV2/CVC2/or CID for Amex. 

For all cards:

Expiration Dates	  CVV2 / CVC3	CID (American Express)
08/2018 OR 10/2020	737	7373