Posts

Reactive Extensions for Javascript – Observable vs ConnectableObservable

For those of you who are familiar with Reactive Extensions you should know all about observables already, but did you know that there’s another kind of observable sequence – Rx.ConnectableObservable. The difference between the two types of observable sequences is well explained here, in short, a connectable observable sequence allows you to share the same …

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Reactive Extensions for Javascript – Causing side effects with Do

Javascript, Programming, Rx

I wrote previously about how you can set up multiple observable sequences and subscribe to them with multiple observers and create a many-to-many relationship between them. Whilst this is a very flexible model with a clear separation of responsibilities, often it requires more work to set up and is more than what you need for …

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HashSet vs List vs Dictionary

.Net, C#, Performance, Programming

Out of curiosity after reading some articles on how the HashSet<T> (introduced in .Net 3.5) class is more performant than the List<T> class for set operations, I set about doing some experiments of my own to get a feel of just how much faster a HashSet is, and under what circumstances. Also, whilst there’s been …

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Type.IsSubclssOf and Type.IsAssignableFrom

.Net, C#, Programming

On the Type class there are two very useful methods which allows you to determine the inheritance relationship of two arbitrary types at runtime – IsSubclassOf method and IsAssignableFrom method. IsSubclassOf The MSDN documentation for the IsSubclassOf method states: Determines whether the class represented by the current Type derives from the class represented by the …

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Reactive Extensions for Javascript – Wikipedia lookup demo

Javascript, Programming, Rx

Matthew Podwysocki posted a couple of very good articles on RxJS on codebetter.com and amongst them was a simple demo to do a look up on wikipedia using their open API: Introduction to the Reactive Extensions for JavaScript – Wikipedia Lookup Unfortunately, there wasn’t a live demo you can play around with and see it …

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Reactive Extensions for Javascript – Multiple observers for multiple observables

Javascript, Programming, Rx

One of the great things about the Reactive Extensions for Javascript is that you can easily create a many-to-many relationship between observable sequences of values and observers who handles the arrival of new values. You should have a read of these couple of posts first: Introduction to the Reactive Extensions for Javascript – Creating Observables …

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Drag and Drop using Reactive Extensions for Javascript

Javascript, Programming, Rx

Been a while since I’ve been meaning to check out Reactive Extensions for Javascript, I have been using the .Net version for a while now and blogged about some of the cool things you can do with the .Net version. Although there are many sources where you can learn about it from they don’t have …

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Test your maths skills at the MathDOJO!

CSS3, Games, HTML5, Javascript, Programming

Another productive weekend bares fruit for another mini game! This time I’ve put together a dojo-themed mini game whose sole purpose is to test your ability to do simple (well, mostly) arithmetic calculations in your head and your tolerance for my sense of humour (which is not so bad I hope ;-) ). Screenshots Here’s …

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Creating a count down meter with CSS3 and JQuery

CSS3, Javascript, Programming

Whilst working on the MathDOJO mini game one of the neat little things I tried to do was implement a time meter which steadily counts down and changes colour (from green to yellow to glowing red) as it approaches 0: First, you need something to represent the meter, a simple <span> element will do: 1: …

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Converting List<T> using covariance

.Net, C#, LINQ, Programming

I saw an interesting use of covariance today, consider an interface IMyClass and an implementing class MyClass: 1: public interface IMyClass { } 2: 3: public class MyClass : IMyClass { } If you want to convert an List<MyClass> to a List<IMyClass> you would normally use the Enumerable.Cast method but did you know that you …

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