Mohamed Attia cipherself

xitdb-clj is a new immutable database for Clojure. It can time travel like Datomic, and store data in a single file like SQLite. On its own, though, it has no query language. Enter Datascript...

Datascript is normally an in-memory database, but it lets you use anything as backing storage. What if we combined them?

Datascript's storage feature doesn't tell us exactly what changed, so I added one more trick: Editscript, the diffing library. I use it to figure out how to update the database with the minimal number of changes.

The end result is a sort of mini Datomic that writes to a single file. And yet, this setup can do something Datomic can't: it can branch off of any old copy of the database. The example below reverts to an older copy of the database.

Keep in mind that all reads and writes are incremental. The database is not being loaded into memory at once, so you can use it to

These links no longer work. Springer have pulled the free plug.

Graduate texts in mathematics

duplicates = multiple editions

A Classical Introduction to Modern Number Theory, Kenneth Ireland Michael Rosen

Don't use VPN services.

No, seriously, don't. You're probably reading this because you've asked what VPN service to use, and this is the answer.

Note: The content in this post does not apply to using VPN for their intended purpose; that is, as a virtual private (internal) network. It only applies to using it as a glorified proxy, which is what every third-party "VPN provider" does.

A Russian translation of this article can be found here, contributed by Timur Demin.
A Turkish translation can be found here, contributed by agyild.
There's also this article about VPN services, which is honestly better written (and has more cat pictures!) than my article.

Essential JavaScript Links

I no longer mantain this list. There are lots of other very comprehensive JavaScript link lists out there. Please see those, instead (Google "awesome JavaScript" for a start).

Typing Haskell in Haskell

MARK P. JONES

Pacific Software Research Center

Department of Computer Science and Engineering

Oregon Graduate Institute of Science and Technology

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.

303 See Other

Location: https://github.com/wsargent/docker-cheat-sheet

Hi there!

The docker cheat sheet has moved to a Github project under https://github.com/wsargent/docker-cheat-sheet.

Please click on the link above to go to the cheat sheet.

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

	#!/usr/bin/env python
	# Quick and dirty demonstration of CVE-2014-0160 by
	# Jared Stafford ([email protected])
	# Modified so that it finds cookies

	import sys
	import struct
	import socket
	import time
	import select

	So you want to accept payments online with PHP?

	- Well, you probably don't want to handle that process manually. Too dangerous and risky.
	- So learn the Stripe API. Works great!
	- But you'll still need to setup SSL. So go learn how to do that.
	- Stripe provides a PHP package, so download that through Composer. If you're not familiar with Composer, you'll need to learn that too.
	- If you want the most flexibility, you'll want to manually create the payment form.
	- So you'll need to send an AJAX request with a special token to Stripe's API. jQuery makes this easy, so go learn jQuery.
	- Once the payment completes, you'll likely want to send the buyer a "Purchased" email, so learn how to send email.
	- But don't make the user wait for the email to send. That takes too long. Add that to a background job.