Edygar de Lima Oliveira edygar

The introduction to Reactive Programming you've been missing

So you're curious in learning this new thing called Reactive Programming, particularly its variant comprising of Rx, Bacon.js, RAC, and others.

Learning it is hard, even harder by the lack of good material. When I started, I tried looking for tutorials. I found only a handful of practical guides, but they just scratched the surface and never tackled the challenge of building the whole architecture around it. Library documentations often don't help when you're trying to understand some function. I mean, honestly, look at this:

Rx.Observable.prototype.flatMapLatest(selector, [thisArg])

Projects each element of an observable sequence into a new sequence of observable sequences by incorporating the element's index and then transforms an observable sequence of observable sequences into an observable sequence producing values only from the most recent observable sequence.

	var fs = require('fs');

	module.exports = function getSubDirectories( dir )
	{
	var deferred = new Promise();
	var dirs = [], count = 0;

	fs.readdir(dir, function(err, files)
	{
	if (err) deferred.error(err);

	{
	// -----------------
	// --------------------------------------------------------------------
	// JSHint Configuration, Strict Edition
	// --------------------------------------------------------------------
	//
	// This is a options template for [JSHint][1], using [JSHint example][2]
	// and [Ory Band's example][3] as basis and setting config values to
	// be most strict:
	//

	function zeroRight(i) {
	var j = 1,
	k = i;

	while(k > 10) {
	j *= 10;
	k = parseInt(k/10);
	}

	return k*j;

	// Save to... /Applications/Adobe Illustrator CC/Presets.localized/<LOCALE>/Scripts/
	// Polyfill for forEach
	function forEach(array, fn, scope) {
	scope = scope \|\| array;
	// array is cloned in order to allow mutations
	// in `fn` but not suffer from them, so iteration
	// keeps normally.
	array = Array.prototype.slice.call(array,0);

	for(var i = 0, len = array.length; i < len; i++) {

	function get(path) {
	return user.waitForAuthentication()
	.then(function() {
	return $http.get(path);
	})
	.then(function(response){
	return resposne data;
	})
	}

	# Para números inteiros, é bem mais fácil
	puts "Input a number: "
	# a gente lê para o input o que o usuário digitou e
	# testa de convertando para inteiro e depois para string
	# o valor continua sendo o mesmo, se sim, é inteiro:
	# Exemplos:
	# "asdasda".to_i => 0.to_s => "0" != "asdasda"
	# "0".to_i => 0.to_s => "0" == "0"
	# "123123".to_i => 123123.to_s => "123123" == "123123"
	while(input = gets.chomp and input.to_i.to_s != input)

	import netPing from 'net-ping';
	import express from 'express';
	import http from 'http';
	import dns from 'dns';
	import socketIO from 'socket.io';
	import { BehaviorSubject, Observable } from 'rx';

	const app = express();
	const server = http.Server(app);
	const io = socketIO(server);

	import Ember from 'ember';

	export default Ember.Controller.extend({
	appName:'Ember Twiddle',
	selected: 0,
	options: [1, 2],

	actions: {
	select(index) {
	this.set('selected', index);