REACTIVE programming FRAMEWORK

Who uses RX

Microsoft

 Trello

Netflix

SoundCloud 

Problem

How difficult is to manage asynchronous data?

Solution?

I don't mind whether you have the data or not, just keep going

Don't wait the data and continue working

Solution?

I hope the data is coming soon, I was expecting it to come a long time ago

Function callback

Solution

You take my word I will give you a result, or at least tell you I failed at it

Promises

Solution

Promises

Multiple times

Observable

How it Works

GENERATOR​

OBSERVABLE​

PROMISE

FUNCTION

Synchonous

Asynchonous

Multiple

Single

Reactive Programming

What is Reactive Programming?

Reactive Manifesto

Microsoft's Rx terminology

KISS

Reactive programming is programming with asynchronous data streams

Reactive in Action

Event buses are really asynchronous event streams, on which you can observe and do some side effects.

Reactive is that idea on steroids

DAta streams

You are able to create data streams of anything

variables, user inputs, properties, caches, data structures, etc.

Functions and more

you are given an amazing toolbox of functions to combine, create and filter any of those streams

Importat Concepts

  • Pure functions:
    • ​Same result with same given parameters
  • High order functions:
    • Receives Functions => Returns Functions
  • Iterator:
    • Sequential access to data
  • Observer:
    • Notify changes, one to many relationship

Advantages

Reactive Systems are:

 

- flexible y scalable

- highly responsive

- failure tolerant

- evolutive

Flexible

When a change is required the response is managed by our set of tools

Changes in data streams are easy to make

RESPONSIVE

The user will get an immediate response

No delay between an action and its result

Evolutive

The application can grow and expand new features with no time

Making the code easier to maintain and evolve

Overview

Overview

Overview

Overview

Overview

Overview

http://reactivex.io/documentation/operators/combinelatest.html

Rxjs marbles

http://rxmarbles.com/

REAL POWER

https://github.com/Reactive-Extensions/RxJS

RX MORE than JS

http://reactivex.io/

RX MORE than JS

Disadvantages

Learning it is hard, even harder by the lack of good material

Disadvantages

the master sword - starts with low power

Disadvantages

Don't know how to use the master sword you just swing it

you go through trials to increase the master sword power

Disadvantages

you go through trials to increase the master sword power

Disadvantages

the master sword becomes the most powerful weapon you can use

Disadvantages

  • Just a tool you don't know how to use it

  • Hard to debug

  • Learning it requires patience and experimentation

  • Difficult to drop observables/reactive programming into existing complex apps

What´s New

Goals

  • Smaller overall bundles sizes
  • Provide better performance than preceding versions of RxJS
  • To model/follow the Observable Spec Proposal to the observable.
  • Provide more modular file structure in a variety of formats
  • Provide more debuggable call stacks than preceding versions of RxJS

OBSERVABLE AS STANDARD

  • https://github.com/tc39/proposal-observable

SugGestions

  • Keep observables as simple as possible
  • Keep consistent data sources
  • Models representing data are required
  • Do not to overload an observer with too many functions

Thank You!

References

  • http://slides.com/santiagorodriguezsordo/functional-reactive-programming-spanish
  • https://michalzalecki.com/use-rxjs-with-react/
  • https://medium.com/frintjs/deep-dive-into-observed-components-with-react-js-and-frintjs-e2726eaeff2b
  • https://x-team.com/blog/rxjs-observables/
  • https://xgrommx.github.io/rx-book/index.html
  • https://gist.github.com/staltz/868e7e9bc2a7b8c1f754
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