Intro to Redux

Early App Methodologies

MVC

  • M - Model - The data involved in your application
  • C - Controller - The programming that uses that data (App/Business Logic)
  • V - View - The Code for the UI

 

  • Sometimes we made hybrid structures, like view-controllers
    • This is why you'll hear the term MVVM, MVVC
      • became known as MV*
  • React is a View-layer technology
  • To have more structure to our apps we need more than a view layer... there is no control of events/data flow here!

Flux Methodologies

Data Flow

  • Data flow is important in an app
    • The order in which things happen is important
    • You don't want race conditions to occur
  • In the SPAs Angular 1 took an early lead with developers due to its two-way data binding and watch abilities
  • Issue was that that could rack up lots of watchers in your application, even though Angular 1 cleans them up for you, to an extent.
  • Watchers could 'go stale'
  • Facebook decided to approach the problem differently, using one-way data flow
  • Facebook looked to an older methodology called Flux

Flux

UI Controllers

Stores

Basket

Products

List

Account Options

Products

User

Account

Staff

Meet the staff

D

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p

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t

c

h

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A

c

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n

 

C

r

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a

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o

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{

type: 'START_SALE'

}

{

type: 'ADD_STAFF',

name: 'Phoebe Jones'

}

Actions

P

a

g

e

UI Events

Redux

Simplifying the model

Docs: https://redux.js.org/

UI Controllers

Store

Basket

Products

List

Account Options

Products

User

Account

Staff

Meet the staff

A

c

t

i

o

n

 

C

r

e

a

t

o

r

s

{

type: 'START_SALE'

}

{

type: 'ADD_STAFF',

name: 'Phoebe Jones'

}

Actions

P

a

g

e

UI Events

Principles of Redux

http://redux.js.org/docs/introduction/ThreePrinciples.html

  1. Single Source of Truth - one central store
  2. State is read-only
  3. Changes to state are made with 'pure functions'

Concepts Demo

https://codepen.io/jmsherry/pen/dWNaYj

Tools

DevTools Extensions

Boilerplate

http://mern.io/documentation.html

With MongoDB

With PostgresSQL

https://reactstarter.com

https://github.com/wellyshen/react-cool-starter

Further Reading

Resources

Testing React

How far can you take this?

JS: Redux

By James Sherry

JS: Redux

A brief introduction to flux methodology, focussing on Redux

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