Michał Marczyk michalmarczyk

Virtual DOM and diffing algorithm

There was a [great article][1] about how react implements it's virtual DOM. There are some really interesting ideas in there but they are deeply buried in the implementation of the React framework.

However, it's possible to implement just the virtual DOM and diff algorithm on it's own as a set of independent modules.

Basecamp was under network attack

The attack detailed below has stopped (for the time being) and almost all network access for almost all customers have been restored. We're keeping this post and the timeline intact for posterity. Unless the attack resumes, we'll post a complete postmortem within 48 hours (so before Wednesday, March 26 at 11:00am central time).

Criminals have laid siege to our networks using what's called a distributed denial-of-service attack (DDoS) starting at 8:46 central time, March 24 2014. The goal is to make Basecamp, and the rest of our services, unavailable by flooding the network with bogus requests, so nothing legitimate can come through. This attack was launched together with a blackmail attempt that sought to have us pay to avoid this assault.

Note that this attack targets the network link between our servers and the internet. All the data is safe and sound, but nobody is able to get to it as long as the attack is being successfully executed. This is like a bunch of people

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.

EuroClojure 2014, Krakow

Fergal Byrne, Clortex: Machine Intelligence based on Jeff Hawkins’ HTM Theory

@fergbyrne
HTM = Hierarchical Temporal Memory
Slides

big data

big data is like teenage sex
- noone knows how to do it
- everyone thinks everyone else is doing it

	;; based on http://talks.golang.org/2012/concurrency.slide#50

	(ns robpike
	(:require [cljs.core.async :as async :refer [<! >! chan close!]])
	(:require-macros [cljs.core.async.macros :as m :refer [go alt!]]))

	(defn timeout [ms]
	(let [c (chan)]
	(js/setTimeout (fn [] (close! c)) ms)
	c))

	(ns async_match
	(:require [cljs.core.async :refer [chan sliding-buffer]]
	[clojure.string :as string])
	(:require-macros
	[cljs.core.async.macros :as m :refer [go alts!]]
	[clojure.core.match.js :refer [match]]))

	(def mc (chan (sliding-buffer 1)))
	(def loc-div (.getElementById js/document "location"))

	(ns spreads
	(:use zeder))

	(def legal-cards
	[:🂡 :🂱 :🃁 :🃑

	:🂢 :🂲 :🃂 :🃒

	:🂣 :🂳 :🃃 :🃓

	(defn f []
	(-> #{}
	(transient)
	(conj! -24)
	(persistent!)
	(conj 0)
	(conj 0)
	(conj 0)
	(conj 0)
	(conj 0)

	;; Tetrahedron intersection based on this paper & algorithm:
	;; http://vcg.isti.cnr.it/Publications/2003/GPR03/fast_tetrahedron_tetrahedron_overlap_algorithm.pdf
	;;
	;; Unlike original algorithm this implementation produces correct
	;; results regardless of the orientation/ordering of points defining
	;; the two tetrahedra. This is achieved via the orient-tetra function,
	;; which ensures the correct ordering of vertices for this algorithm
	;; to function properly.
	;;
	;; Implementation extracted from upcoming geometry library

	(ns bar.baz
	(:require [vertigo.core :as vc]
	[vertigo.structs :as vs]))

	;;
	;; based off of work by Michał Marczyk
	;; http://stackoverflow.com/questions/8949837/binary-search-in-clojure-implementation-performance
	;;

	(set! warn-on-reflection true)