Anand Dhillon anand180

The introduction to Reactive Programming you've been missing

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.

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!

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#Intro

Kotlin is a new programming language for the JVM. It produces Java bytecode, supports Android and generates JavaScript. The latest version of the language is Kotlin M5.3

Kotlin project website is at kotlin.jetbrains.org.

All the codes here can be copied and run on Kotlin online editor.

Let's get started.

	class PurchaseApprover
	# Implements the chain of responsibility pattern. Does not know anything
	# about the approval process, merely whether the current handler can approve
	# the request, or must pass it to a successor.
	attr_reader :successor

	def initialize successor
	@successor = successor
	end

	var child_process = require('child_process');

	exports.handler = function(event, context) {
	var proc = spawn('./test', [ JSON.stringify(event) ], { stdio: 'inherit' });

	proc.on('close', function(code){
	if(code !== 0) {
	return context.done(new Error("Process exited with non-zero status code"));
	}

	# Original Rails controller and action
	class EmployeesController < ApplicationController
	def create
	@employee = Employee.new(employee_params)

	if @employee.save
	redirect_to @employee, notice: "Employee #{@employee.name} created"
	else
	render :new
	end

	# Note (November 2016):
	# This config is rather outdated and left here for historical reasons, please refer to prerender.io for the latest setup information
	# Serving static html to Googlebot is now considered bad practice as you should be using the escaped fragment crawling protocol

	server {
	listen 80;
	listen [::]:80;
	server_name yourserver.com;

	root /path/to/your/htdocs;

	# Create vagrant image
	vagrant init ubuntu12_64 http://files.vagrantup.com/precise64.box
	vagrant up
	vagrant ssh

	# Fork aws/opsworks-cookbooks on github
	# https://github.com/aws/opsworks-cookbooks
	# Clone locally
	git clone [email protected]:yourusername/opsworks-cookbooks.git
	cd opsworks-cookbooks

	http://robots.thoughtbot.com/convert-ruby-1-8-to-1-9-hash-syntax

	search = :([^ ])(\s)=>
	replace = $1:

	package com.yourApplication.inject

	import com.google.inject._
	import net.codingwell.scalaguice.InjectorExtensions.ScalaInjector
	import net.codingwell.scalaguice.ScalaModule
	import com.google.inject.util.Modules

	import play.api.Mode._
	import play.api.Mode
	import java.util.concurrent.atomic.AtomicBoolean