Daniel Earwicker Chief Software Architect
CNL Software Ltd

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?

Read on...


TypeScript multicast functions

TYPESCRIPT 2016-03-13

Just as in JavaScript, C# functions are first class entities - you can pass them around in variables. There are two ways that C# differs from JavaScript.

  1. a method's this reference is automatically bound to the object it belongs to. In JS a "method" is just an object property that happens to contain a function. If copied into a separate variable and then called, there may or may not be a problem depending on whether the function internally refers to this.

  2. a function value (known as a "delegate") has operators +, -, +=, -= that allow it to be combined with other compatible functions to create a new single function that, when invoked, causes the constituent functions to be invoked.

The second one is what I'm interested in today, mainly because it's a nice example of something that we can strongly type check in TypeScript. Internally (at the "plumbing" level) we have to bypass type checks, but externally we can guarantee everything will work.

Read on...


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.

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TypeScript is not really a superset of JavaScript and that is a Good Thing

TYPESCRIPT 2015-07-11

Questions:

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A new kind of managed lvalue pointer

ROSLYN 2014-04-27

It's already the evening and I haven't yet added anything to the C# compiler today, so here goes!

Properties have special support in C#, but they are not "first class". You can't get a reference to a property and pass it around as a value. Methods are much better served in this regard: delegates are a way to treat a method as a value. But they are just objects with an Invoke method.

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Using pointer syntax as a shorthand for IEnumerable

ROSLYN 2014-04-26

Another quickie extension to C#. In the current language, a type declaration T! is shorthand for Nullable.

But equally important in modern C# programs are sequences of values, so a similar shorthand for IEnumerable would be ideal. The asterisk symbol is underused (you can suffix a type with asterisk to make a pointer, but only in unsafe contexts), and this was the choice made by the intriguing research language Cω

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Adding crazily powerful operator overloading to C# 6

ROSLYN 2014-04-23

I'm going to show you how to enable a new kind of operator overloading by adding exactly four (4) lines of code to a single file in the C# 6 compiler preview. Yes, I was surprised too!

After seeing the video of Anders Hejlsberg showing how easy it is to hack the new open source C# compiler, I had to give it a try.

My aim was (I assumed) a lot more ambitious and crazy than his demo. I thought it would take ages to figure out. But it was still tempting to aim high and actually implement a substantial new feature, because there are a few I've been wondering about over the years.

Ever since LINQ query syntax was added to the language, I've wished that operator overloading worked the same way. The where keyword gets turned into a call to a Where method. And it doesn't matter where or how that method is defined. It can be an extension method, an ordinary method, a virtual method. In fact there are few other language features that map to well known member names: a collection initializer is turned into several calls to a method called Add, and the await keyword expands into calls to several methods.

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Introducing Carota

JAVASCRIPT 2013-11-04

This project was a lot of fun, but it has a big roadblock that has to be overcome by any text-based project: internationalisation. Hence I don't see it being generally useful outside of Western-language-only projects without a lot more work.

I'm developing a rich text editor from scratch in JavaScript, atop the HTML5 canvas. It's called Carota (Latin for carrot, which sounds like "caret", and I like carrots).

Here is the demo page, which is very self-explanatory, in that it presents a bunch of information about the editor, inside the editor itself, so you can fiddle with it and instantly see how it persists the text in JSON. As you can see, it's quite far along. In fact I suspect it is already good enough for every way I currently make use of rich text in browser applications. If your browser is old, it will not work. (Hint: IE8 is way old.)

So... Why? What a crazy waste of time when browsers already have the marvellous contentEditable feature, right?

Read on...


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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