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 …
Reactive Extensions for Javascript – Wikipedia lookup demo Read More »
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 …
Reactive Extensions for Javascript – Multiple observers for multiple observables Read More »
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 …
Drag and Drop using Reactive Extensions for Javascript Read More »
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 …
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: …
Creating a count down meter with CSS3 and JQuery Read More »
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 …
Looking at these two images snapped right off MSDN, what do you notice? . . . that IEnumerable<T> extends IEnumerable but IList<T> doesn’t extend IList!? I know, peculiar isn’t it? Turns out, it was for a good reason: "A sequence of integers can be treated as a sequence of objects, by boxing every integer …
Found another interesting post on Eric Lippert’s blog, this one explain the rationales behind why there’s no built-in Enumerable.ForEach extension method, one which myself and no doubt many others had decided to implement ourselves. As he explains, there are two main philosophical reasons why he’s against such an extension method: "The first reason is that …
Eric Lippert on the decision to omit Enumerable.ForEach Read More »
For a while now I’ve been wondering why C#’s support for covariance does not cover value types, both in normal array covariance and covariance in the generic parameter introduced in C# 4: 1: void Main() 2: { 3: int i = 0; 4: string str = "hello world"; 5: 6: TestMethod(i); // legal 7: TestMethod(str); …
The other day I had an interesting observation on the optional parameters in C# 4, whereby if you specify a parameter as optional on an interface you don’t actually have to make that parameter optional on any implementing class: 1: public interface MyInterface 2: { 3: void TestMethod(bool flag=false); 4: } 5: 6: public class …
Interesting observation on C# 4’s optional parameter Read More »
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