Implement Array Shuffling in MooTools
While shuffling the order of array elements isn't a greatly useful function, I recently found myself needing to accomplish the task. I found a great post about how to achieve this feat using jQuery. Here's how to implement array shuffling in MooTools.
The MooTools JavaScript
Array.implement({
shuffle: function() {
//destination array
for(var j, x, i = this.length; i; j = parseInt(Math.random() * i), x = this[--i], this[i] = this[j], this[j] = x);
return this;
}
});
This likely wont be used in the core framework but does have its uses.
![Responsive and Infinitely Scalable JS Animations]()
Back in late 2012 it was not easy to find open source projects using requestAnimationFrame() - this is the hook that allows Javascript code to synchronize with a web browser's native paint loop. Animations using this method can run at 60 fps and deliver fantastic...
![Camera and Video Control with HTML5]()
Client-side APIs on mobile and desktop devices are quickly providing the same APIs. Of course our mobile devices got access to some of these APIs first, but those APIs are slowly making their way to the desktop. One of those APIs is the getUserMedia API...
![dwProgressBar v2: Stepping and Events]()
dwProgressBar was a huge hit when it debuted. For those of you who didn't catch my first post, dwProgressBar is a MooTools 1.2-based progress bar which allows for as much flexibility as possible. Every piece of dwProgressBar can be controlled by CSS...
![Style Textarea Resizers]()
Modern browsers are nice in that they allow you to style some odd properties. Heck, one of the most popular posts on this blog is HTML5 Placeholder Styling with CSS, a tiny but useful task. Did you know you can also restyle the textarea resizer in WebKit...
Another way (more elegant in my opinion):
Array.implement({ shuffle:function() { this.sort(function (x,y) { return Math.floor(Math.random()*3)-1; }); return this; } }); alert([1,2,3,4,5,6,7,8].shuffle());@Elad: Awesome! Nice work. Definitely more elegant.
Just a note that you can do cool stuff like this with Array Shuffling. :)
@Lim Chee Aun: Awesome!
I’ll point out that @David’s example is guaranteed to not require any additional storage space (it shuffles in place), is unbiased toward permutations, and runs in O(n) time. @Elad’s shuffle depends on the browser’s implementation of sort(). It may require more storage space, it may be biased to certain permutations, and it will run in O(n log n) time or worse due to the nature of sorting. However, I’m guessing that anything shuffled in JS is going to be small and no one will care if it is biased as long as it “seems” random.
I’ve tested both Elad and David script on a 27 lenght array… the shuffling is far better using David’s one….
Anyone for the best of both world : efficiency and elegance ?
Anyway thank you so much for the tip !
I’m trying to learn mootools (both in a general sense, and all over again with 1.2), and javascript OOP at the same time. How I use this to shuffle the order of some list elements on a webpage?
And, if you don’t mind, how would I do this in 1.1 vs. 1.2?
Hehe although the original idea is older than my mom (probably no one here knows the creator of this…), I would be glad if people could copy my things keeping the credits ^^
http://jsfromhell.com/array/shuffle