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2015-01-29 Unofficial Relay FAQ

Compilation of questions and answers about Relay from React.js Conf.

Disclaimer: I work on Relay at Facebook. Relay is a complex system on which we're iterating aggressively. I'll do my best here to provide accurate, useful answers, but the details are subject to change. I may also be wrong. Feedback and additional questions are welcome.

What is Relay?

Relay is a new framework from Facebook that provides data-fetching functionality for React applications. It was announced at React.js Conf (January 2015).

Clojure on Raspberry Pi with OS X

"Clojure running on Raspberry Pi" sounded so cool that I just had to give it a try.

Install JDK

Download ARM JDK from Oracle and instlal on Raspberry Pi
Change visudo to contain the following

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.

	$fs=1;
	$fa=1;

	servo_l = 24;
	servo_w = 13;
	servo_h = 21;

	bolt_hole_diameter = 4.5;
	servo_axis_diameter = 4;

	(defn pp-type [f]
	(if (and (sequential? f) (<= 3 (count f)) (symbol? (first f)) (= (name (first f)) "All"))
	(str "(All " (pr-str (second f)) "\n " (str/join "\n " (str/split (pp-type (nth f 2)) #"\n" )) ")")
	(if (and (sequential? f) (<= 3 (count f)) (symbol? (first f)) (= (name (first f)) "IFn"))
	(str "(IFn " (str/join "\n " (map pr-str (rest f))) ")")
	(pr-str f))))

	(defn pretty-print-type [f]
	(-> (pp-type f)

	(ns variant
	(:require [clojure.core.typed :as t]))

	(t/defalias V
	(t/Rec [V]
	(t/U '[':lambda t/Sym V]
	'[':if V V V]
	'[':val t/Any])))

	(t/ann command [V -> t/Str])

	(ns quaternion-exploration
	(:import [UnityEngine Quaternion Vector3])
	(:use arcadia.core
	arcadia.hydrate
	clojure.repl
	clojure.pprint))

	;; like emacs. kind of.
	(defn kill! [x]
	(let [spec (dehydrate x)]

	(ns biology.core
	(:use hard.core hard.input hard.tween unity.messages)
	(:require unity.core))

	(defn scene-spermwhale [_]
	(add [(find-name "Main Camera") :y] -3000 3 (fn [_] (load-scene "spermwhale"))))

	(defn scene-options [_]
	(add [(find-name "Main Camera") :x] -20 1 (fn [_] (load-scene "spermwhale"))))