Comments on: Friday Algorithms: Quicksort – Difference Between PHP and JavaScript

By: Stoimen

Stoimen — Tue, 27 Nov 2012 15:35:00 +0000

Hi tzulac,

Indeed that is a bad practice. However I made it because it’s more important to show the frame of the algorithm. As you know different environemnts have different approaches when trying to optimize a chunk of code and mine is PHP. Thus you can go for a different solution in other languages. That is why I just didn’t focus on this part of the code.

However, thanks for the remark!

By: tzulac

tzulac — Tue, 27 Nov 2012 13:32:22 +0000

I started to study algorithm (and started with sorting algorithms of course!) and found some interesting thing. I looked on the web for examples and all use at iteration something like that (and you too):
for ($i = 1; $i < count($array); $i++)…
I found that is not efficient as time consuption because array elements must be counted at every iteration. I think is optim to memorize counted value first. I run some test and found that.
What is your opinion?

By: Filip

Filip — Mon, 01 Oct 2012 16:18:00 +0000

I did mistake. =) I meant, that this implementation works with PHP, C++, Pascal but with javascript it doesn’t work, because of undefined statement. There are lots of implementation, but no one is suited for animation that I need to school project.

Thank you very much! =)

By: Filip

Filip — Mon, 01 Oct 2012 15:59:38 +0000

http://pastebin.com/UFaT4r4C (val[] is array)

I need quick sort that doesn’t work with buffers, like you did. Just let it work on one array, because I want to animate it and each swap save in another array to use it on animating etc… This algorithm works with PHP, C++, but with this implementation, it doesn’t work. In while loops I get into undefined statement and whole algorithm loops forever.

By: Stoimen

Stoimen — Mon, 01 Oct 2012 15:13:57 +0000

@Filip – please provide some code as an example!

By: Filip

Filip — Mon, 01 Oct 2012 15:07:49 +0000

Hi, I have to make javascript quick sort animation but I have some troubles. Please… don’t you know, how to make it possible? Because of undefined statement I’m quite disoriented.