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.
![Create Namespaced Classes with MooTools]()
MooTools has always gotten a bit of grief for not inherently using and standardizing namespaced-based JavaScript classes like the Dojo Toolkit does. Many developers create their classes as globals which is generally frowned up. I mostly disagree with that stance, but each to their own. In any event...
![CSS Animations Between Media Queries]()
CSS animations are right up there with sliced bread. CSS animations are efficient because they can be hardware accelerated, they require no JavaScript overhead, and they are composed of very little CSS code. Quite often we add CSS transforms to elements via CSS during...
![CSS Scoped Styles]()
There are plenty of awesome new attributes we've gotten during the HTML5 revolution: placeholder, download, hidden, and more. Each of these attributes provides us a different level of control over an element on the page, but there's a new element attribute that allows...
![CSS Selection Styling]()
The goal of CSS is to allow styling of content and structure within a web page. We all know that, right? As CSS revisions arrive, we're provided more opportunity to control. One of the little known styling option available within the browser is text selection styling.
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