Add store.one() method to store.on.js

[aensley]

I'm finding myself needing to attach an event handler to a key's change event only once. I'm used to jQuery's .one() method and am emulating it right now with:

function myStoreOne(key, fn)
{
    var handler = function(e){
        store.off(key, handler); // unbind to prevent future events.
        return fn.call(this, e);
    };
    store.on(key, handler); // bind to the event.
}

Would be nice to be able to just call store.one(key, fn) instead.

[nbubna]

Store is extensible; if you do it like this, you make it available for all namespaces and storage areas:

store._.fn('one', function(key, fn) {
    if (!fn) { fn = key; key = ''; }// no key === all keys
    var s = this, _fn;
    return s.on(key, _fn = function(e) {
        s.off(key, _fn);
        return fn.apply(this, arguments);
    };
}

As for adding it to store.on, i'm not digging the store.one() naming. If you aren't friendly with jQuery.one, then it doesn't look like an event method. store.onOne is clearer, but admittedly less graceful. Maybe store.once? Argh. I'd like to believe there's always a perfect name, but alas... Failing that, what do you prefer?

[aensley]

I like store.one(). I know not everyone uses jQuery, but it is pretty ubiquitous.

I also like store.once(). I think that's a good compromise, and it clearly indicates what it does. I'm not sure why jQuery didn't go that route. It's much clearer.