George Masgras gmas

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).

Introduction

At DICOM Grid, we recently made the decision to use Haskell for some of our newer projects, mostly small, independent web services. This isn't the first time I've had the opportunity to use Haskell at work - I had previously used Haskell to write tools to automate some processes like generation of documentation for TypeScript code - but this is the first time we will be deploying Haskell code into production.

Over the past few months, I have been working on two Haskell services:

A reimplementation of an existing socket.io service, previously written for NodeJS using TypeScript.
A new service, which would interact with third-party components using standard data formats from the medical industry.

I will write here mostly about the first project, since it is a self-contained project which provides a good example of the power of Haskell. Moreover, the proces

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.

Java uses static, declared typing:

String hello = "Hello, World!";
List<String> phrases = new ArrayList<String>;
phrases.add(hello);
phrases.add(null);
phrases.add(123); // Compile error! Not a string.

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

	machine:
	environment:
	JAVA_TOOL_OPTIONS: '-Dfile.encoding=UTF8 -Duser.timezone=UTC'
	_JAVA_OPTIONS: '-Xms512m -Xmx1024m -Xss2m'
	java:
	version: oraclejdk8
	python:
	version: 2.7.6
	services:
	- docker

	$ cd ~
	$ sudo curl -sS https://getcomposer.org/installer \| sudo php
	$ sudo mv composer.phar /usr/local/bin/composer
	$ sudo ln -s /usr/local/bin/composer /usr/bin/composer

	then you can run
	$ sudo composer install

	def required(arg=nil)
	method = caller_locations(1,1)[0].label
	raise ArgumentError.new("required parameter #{arg.to_sym.inspect + ' ' if arg}not passed to method #{method}")
	end

	def say(greeting: required('greeting'))
	puts greeting
	end

	def say2(greeting: required)

	class Person
	def self.destructor name
	proc{ puts "I AM DYING: #{name}"}

	end

	attr_reader :name
	def initialize name
	@name = name
	ObjectSpace.define_finalizer self, Person.destructor(name)

	;; http://lispyscript.com
	;; LispyScript example using nodejs, expressjs and twitter bootstrap
	;; LispyScript templates are written in LispyScript!
	;; Html5 templates support all html5 tags

	;; The express server

	(var express (require "express"))
	(var app (express))
	(app.listen 3000)