Denis Fuenzalida dfuenzalida

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

Building a blockchain, assisted by Clojure spec

In an effort to gain at least a superficial understanding of the technical implementation of cryptocurrencies, I recently worked my way through "Learn Blockchains by Building One" using Clojure.

This was a good chance to experiment with using spec in new ways. At work, we primarily use spec to validate our global re-frame state and to validate data at system boundaries. For this project, I experimented with using instrumentation much more pervasively than I had done elsewhere.

This is not a guide to spec (there are already many excellent resources for this). Rather, it's an experience report exploring what went well, what is still missing, and quite a few unanswered questions for future research. If you have solutions for any of the problems I've presented, please let me know!

You don't need to know or care about blockchains to understand the code be

Usage

Fire up a REPL using any of the following forms.

Node

clj -Srepro -Sdeps '{:deps {org.clojure/clojurescript {:git/url "https://github.com/mfikes/clojurescript" :sha "ed1e7373a9ecd8b52084dc438e6c21d23dba47ca"}}}' -m cljs.main -re node

Getting Started with Clojure on Windows

Clojure is an amazingly powerful language. Using it (and watching Rich Hickey videos) has changed the way I think about programming, and the way I code in general. Once I learned the basics of the language, which was a relatively quick process, I fell in love and couldn't look back. I hope this post can help others who are new to Clojure get up and running quickly and painlessly.

This post is opinionated in the sense that I'll suggest certain tools to help those who are new to this scene get on their feet. The things you'll need are:

Leiningen (pronounced LINE-ing-en) - This is like a package manager, build tool, task manager, and more in one tool. Think npm or nuget, but with more capabilities. There is at least one other build tool for Clojure (boot), but Leiningen is the most widely used.
JDK - Clojure runs on Java. Throw out any qualms you may have about Java, we aren't coding in Java (though we can through Clojure, and sometimes tha

	(ns react-cljs.core
	(:require React))

	(declare render)

	(defn handle-change [e]
	(render {:text (.. e -target -value)}))

	(defn render [{:keys [text]}]
	(React/renderComponent

	;; This is at: https://gist.github.com/8655399

	;; So we want a rhyming dictionary in Clojure. Jack Rusher put up
	;; this code here:
	;;
	;; https://gist.github.com/jackrusher/8640437
	;;
	;; I'm going to study this code and learn as I go.
	;;
	;; First I put it in a namespace.

	(ns reagent-test.core
	(:require [reagent.core :as reagent :refer [atom]]
	[datascript :as d]
	[cljs-uuid-utils :as uuid]))

	(enable-console-print!)

	(defn bind
	([conn q]
	(bind conn q (atom nil)))

	;; In Pedestal 0.3.1, you won't have to use an atom.
	;; You'll pass the channel into the SSE creation function (instead of it passing one back to you)
	(def event-ch (atom nil))

	(defn home-page
	[request]
	(ring-resp/response "Hello World!"))

	(defroutes routes
	[[["/" {:get home-page}