Life Beyond RailsBuilding Cross Platform Applications

DEMO

@parasquidChief Problem Solver

at Mindvalley

Why not Ruby on the browser and on

mobile?

Dead end product

So what if voyager can go to Mars, or dive in the ocean

So what if your hackathon was written in JS that runs on both server and client

So what if your legacy code was written in Ruby (cross platform!)

Can you reuse a significant portion of the code you wrote?

Cross platform is useless if your code

can't be reused.

Reuse of prior work across multiple platforms is the

biggest reason why you want cross platform support

“cross platform” is mostly solved in the

physical world

cable

usb powerbank

usb camera

usb phone

usb ereader

• How does this work?

• Which things can I use this with?

• What can this do?

• How does this work?

• Which things can I use this with?

• What can this do?Encapsulation

Polymorphism

(DESCRIPTOR)

• open()• close()• read()• write()• seek()

You’re not a beautiful or unique snowflake.-Tyler Durden, Fight Club

–Linus Torvalds

“Use common tools tooperate on different things.”

principle: common tools operating on different things

technique: polymorphism

Surface Area of the API is small

principle: information hiding

technique: encapsulation

Oooh. But I already know OOP.

OOP is about programming with

objects

OOP is about programming with

objects

OOP is about the organization of your

program

• Procedural• Object Oriented• Functional• Prototype based• Rails-way based• Hybrid / Combination

How are things

connected?

Rails is omakase.I [am] … the head chef of the

omakase experience that is Rails-DHH

To Rails or not to Rails

–Kent Beck

In a connected system, elements are highly available to each other (via global

state, for example). Adding the first feature to a connected system is cheap. All the resources you need are available.

However, the cost of all those connections is that subsequent features are very likely to interact with previous features, driving

up the cost of development over time.

–Kent Beck

A modular design has connections deliberately kept to a minimum. The cost for the first feature is likely to be higher than in the connected system, because

you need to find the necessary resources and bring them together, possibly re-

modularizing in the process. Features are much less likely to interact in a modular

system, though, leading to a steady stream of features at relatively constant

cost.

Stay on the connected curve until the climb phase, then switch to the

modular curve.Kent Beck

App

Rails

request-response

App

TelnetWeb sockets

streaming

App

RubyMotion

mobile

App

Opal

browser

App

mRuby

hardware

Programming is the act of managing

complexity.

Programming is the act of managing

complexity.

Programming is the act of managing

complexity.

Write flexible, maintainable,reusable code

@parasquidChief Problem Solver

at Mindvalley