Ravindranath Akila ravindranathakila

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.

	package com.vast.example

	import java.net.InetSocketAddress
	import java.util.UUID
	import java.util.concurrent.{Executors, TimeUnit}
	import com.google.common.base.Splitter
	import com.twitter.finagle.http.Http
	import com.twitter.finagle.builder.{Server, ServerBuilder}
	import com.twitter.finagle.service.TimeoutFilter
	import com.twitter.finagle.{Service, SimpleFilter, GlobalRequestTimeoutException}

	/**
	* Prepare the App Folder
	*/
	(function(){
	window.appRootDirName = ".myapp";
	document.addEventListener("deviceready", onDeviceReady, false);

	function onDeviceReady() {
	console.log("device is ready");
	window.requestFileSystem = window.requestFileSystem \|\| window.webkitRequestFileSystem;

	{
	"colors": ["#7cb5ec", "#434348", "#90ed7d", "#f7a35c",
	"#8085e9", "#f15c80", "#e4d354", "#8085e8", "#8d4653", "#91e8e1"],
	"symbols": ["circle", "diamond", "square", "triangle", "triangle-down"],
	"lang": {
	"loading": "Loading...",
	"months": ["January", "February", "March", "April", "May", "June", "July",
	"August", "September", "October", "November", "December"],
	"shortMonths": ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"],
	"weekdays": ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"],

	//mapper
	package com.tistory.devyongsik.hadoop.mapre;

	import java.io.IOException;

	import org.apache.hadoop.io.DoubleWritable;
	import org.apache.hadoop.io.LongWritable;
	import org.apache.hadoop.io.Text;
	import org.apache.hadoop.mapreduce.Mapper;

	package example;

	import java.util.Properties;

	import cascading.flow.Flow;
	import cascading.flow.FlowDef;
	import cascading.flow.hadoop.HadoopFlowConnector;
	import cascading.pipe.CoGroup;
	import cascading.pipe.Pipe;
	import cascading.pipe.assembly.CountBy;

	---
	# ^^^ YAML documents must begin with the document separator "---"
	#
	#### Example docblock, I like to put a descriptive comment at the top of my
	#### playbooks.
	#
	# Overview: Playbook to bootstrap a new host for configuration management.
	# Applies to: production
	# Description:
	# Ensures that a host is configured for management with Ansible.

	#!/usr/bin/env bash
	_usage(){
	grep "^[^_].\+(){$" $0 \| while read line; do
	local cmd=$(echo "$line" \| sed "s/(){//g")
	local info=$(grep -C0 -A0 -B1 "$cmd(){" $0 \| sed "N;s/\n.*//g" )
	printf " $0 %-20s %-40s\n" "$cmd" "$info" \| grep "#"
	done; echo "";
	}

	# Runs Cloudera Quick Start image with commonly used Web UI ports. Perquisites: Cloudera Quickstart Image already pulled as cloudera

	#! /usr/bin/env bash

	DAEMONS="${DAEMONS} \
	zookeeper-server \
	hadoop-hdfs-datanode \
	hadoop-hdfs-journalnode \
	hadoop-hdfs-namenode \
	hadoop-hdfs-secondarynamenode \
	hadoop-httpfs \
	hadoop-mapreduce-historyserver \