Is there a map() function in ExtJS?

Question

ExtJS has Ext.each() function, but is there a map() also hidden somewhere?

I have tried hard, but haven't found anything that could fill this role. It seems to be something simple and trivial, that a JS library so large as Ext clearly must have.

Or when Ext really doesn't include it, what would be the best way to add it to Ext. Sure, I could just write:

Ext.map = function(arr, f) { ... };

But is this really the correct way to do this?

Answer 1

Since map is more of a utility than anything, I don't see why there would be any special way of plugging it into the Ext namespace; the way you propose would work well enough, though you might want to do it thusly:

if(Ext && typeof(Ext.map) == "undefined") { // only if Ext exists & map isn't already defined
   Ext.map = function(arr, f) { ... };
}

Seems like that would be fine...but then, I don't use ExtJS, so I don't know. I did take a gander at their docs and it doesn't seem like there is anything special to do in this case.

Answer 2

It appears, that my colleges here are using ext-basex, which extends Array.prototype with map() and other methods.

So I can just write:

[1, 2, 3].map( function(){ ... } );

Problem solved.

Answer 3

ExtJS doesn't replace Javascript language itself. Array functions aren't in the focus of ExtJS core. However there is a special Ext.Array object type. You can extend it on your own.

EDIT: Not Ext.Array, but just extended Array object.

Answer 4

What about using one of the hybrid libraries like Ext+Prototype or Ext+Jquery. I've been using Extjs+Prototypejs for a while now and it helped me a lot to work into the Extjs code with having the more familiar prototypejs along for the ride as well.

http://extjs.com/products/extjs/build/ will build a custom tar/zip file of all the files you need to run extjs and (prototypejs|jquery|yahooUI).