What is interesting about JS
Up until now, I knew that JS is very similar to ActionScript and that it doesn’t have classes and data types. It sounds a little weird, but it’s true JS is object-oriented language, just like C++ or AS3 are, but there are no classes and data types. Instead of it, Prototype-based programming is used. It is a little hard to get used to it, but after some time it doesn’t mind you, or even more, you start to like it
Rewriting AS3 into JS
You can see the result above. I draw diagrams into HTML element “canvas”. Unfortunatelly, I didn’t have an implementation of a heap or priority queue in JS, so i used a classic array. Thus, asymptotic time complexity is $O(n^2)$ instead of $O(n * log(n))$, which AS3 and C++ versions have.
When you rewrite a common object-oriented imperative language into JS, it can be summarized into few steps:
- Remove type specification in variable and function definitions
- int a = 5; var a:int = 5; => var a = 5;
- Rewrite the definitions of classes into function definitions. When you call this function with a “new” keyword, it works as a constructor.
- Attach all class’ methods to it’s prototype.