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Nycto wrote:
> It would absolutely work, but it seemed like a common enough situation
> that a shorthand solution might be available.
If you're a player and really want to get from:
> nodeArray.findAll(function(e) { return e.hasClassName('nameOfClass'); })
to:
nodeArray.findAll('hasClassName', 'nameOfClass');
you'll have to hack Enumerable. Here's an example:
// after loading Prototype, apply your tweaks (separate .js file, etc):
Object.extend(Enumerable, {
// iterator maker - if the argument it's not a Function,
// assume it's a String containing the method name
iterator: function(iterator) {
if (typeof iterator === 'function') return iterator;
var args = Array.prototype.slice.apply(arguments, [1]);
return function(value){return value[iterator].apply(value, args)};
},
// redefine 'findAll', merely by making it call "the iterator maker":
findAll: function() {
var results = [], iterator = this.iterator.apply(this,arguments);
this.each(function(value, index) {
if (iterator(value, index)) results.push(value);
});
return results;
}
});
// apply the "new" Enumerable to all desired objects (Array, Hash, etc):
Object.extend(Array.prototype, Enumerable);
I know, it's pretty dirty - let's call it a proof of concept - I wouldn't
recommend using it unless you heavily use this kind of filtering.
Even then, maybe it's time to search for a different approach, as it surely
looks like having performance problems (given Enumerable's "speed").
cheers
- --
Marius Feraru
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