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 »
As great as LINQ is and how it has transformed the way we interact with data in .Net to the point many of us wonder how we had managed without it all this time! There are however, some pitfalls one can fall into, especially with the concept of delayed execution which is easily the most …
I saw this tutorial the other day, it’s cool but I fancied taking it a step further and make it useful as an app rather than just a fancy way to show some structured data on the screen. Here’s a list of the features which I wanted to add: being able to edit the title …
Creating a sticky note app with HTML5, CSS3 and Javascript Read More »
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