Daniel Earwicker Chief Software Architect
FISCAL Technologies Ltd

Redux in Pieces

JAVASCRIPT IMMUTABILITY FUNCTIONAL REDUX 2017-01-28

Last July I noted down my thoughts on Redux with some hints of the concerns that eventually led to Immuto.

I've since rediscovered my love of observable and computed via MobX, which is like the good parts of Knockout.js made even better by a very careful, thoughtful implementation.

Even so, this is not the same thing as abandoning immutability and purity. There's nothing stopping you using those techniques within a system of observables. Indeed bidi-mobx abstracts away all mutation and allows entire UIs to be declared from pure expressions. The data transformation is carried out by objects called adaptors that contain pairs of pure functions between View and Model representations. Only the user gets to do mutation!

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What's good about Redux

JAVASCRIPT IMMUTABILITY FUNCTIONAL REACT 2016-07-24

Redux is based on series of really simple what-if questions:

  1. What if all the data in your app was immutable?
  2. Okay, now it's stuck. But what if there was only a single solitary mutable variable holding the complete state for your entire app? To change any bit of state, you just assign a slightly different immutable tree to that variable.
  3. And what if the only way to mutate the state was to create a POJO describing a high-level action, and dispatch it through a single giant processing system, describing the change to make?

A number of interesting advantages follow from sticking to this discipline. It's ideal for ReactJS. You can log everything your users do and replay it, stuff like that. You can store the state snapshots, or just the actions, or both. You can recover your app by loading in an old snapshot and then playing the recent actions to bring it up to date. If you want to know the complete story of how your application ended up in the state it's in now, you've got it. And aside from these nice capabilities, it's worth remembering a lot of bugs arise from fiddling with mutable state at the wrong time. Who needs that?

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Introducing doop

TYPESCRIPT IMMUTABILITY 2016-03-08

As great as Immutable.js is, especially with a TypeScript declaration included in the package, the Record class leaves me a little disappointed.

In an ordinary class with public properties we're used to being able to say:

Read on...


json-mobx - Like React, but for Data (Part 2) 2017-02-15
Redux in Pieces 2017-01-28
Box 'em! - Property references for TypeScript 2017-01-11
TypeScript - What's up with this? 2017-01-01
MobX - Like React, but for Data 2016-12-28
Eventless - XAML Flavoured 2016-12-24
Immuto - Epilogue 2016-12-20
Immuto - Radical Unification 2016-09-22
Immuto - Working with React (An Example) 2016-09-16
TypeScript - What is a class? 2016-09-11
Immuto - Strongly Typed Redux Composition 2016-09-11
TypeScript and runtime typing - EPISODE II 2016-09-10
TypeScript and runtime typing 2016-09-04
What's good about Redux 2016-07-24
TypeScript multicast functions 2016-03-13
Introducing doop 2016-03-08
TypeScript is not really a superset of JavaScript and that is a Good Thing 2015-07-11
A new kind of managed lvalue pointer 2014-04-27
Using pointer syntax as a shorthand for IEnumerable 2014-04-26
Adding crazily powerful operator overloading to C# 6 2014-04-23
Introducing Carota 2013-11-04
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