Hi,
On Fri, Dec 12, 2008 at 21:46, Eoghan <[email protected]> wrote:
> After consideration of generalisation, maybe what I'm looking for is a
> version of `partial` that can take out of order arguments, something
> along the following lines:
>
> forEach($$('#my-ul li'), partial(connect,
> MochiKit.Base.placeholder, 'onclick', function(e){
> // do sumn'
> }));
>
> Although I'm not sure what the implementation of partial would look
> like in order to support out of order placeholder arguments...
Ah, yes - I have *often* felt the need for this. Here is one possible
implementation:
function p() {
var args = Array.prototype.slice.call(arguments);
appendChildNodes('logpane', DIV(null, args.join(', ')));
}
var _ = new Object();
var invalidNumberOfArgs = new Error("Number of given arguments does
not match number of unknown arguments.");
function partial() {
var args = Array.prototype.slice.call(arguments);
var f = args.shift();
var unknowns = filter(MochiKit.Base.partial(operator.seq, _), args).length;
return function() {
if (arguments.length != unknowns) {
throw invaldNumberOfArgs;
}
var passed = Array.prototype.slice.call(arguments);
var filled = map(function (a) {
if (a === _) {
return passed.shift();
} else {
return a;
}
}, args);
return f.apply(this, filled);
}
}
function test() {
p('start');
var x = partial(p, "one", _, "three");
x('two');
x = partial(p, _, _, "three", _);
x('one', 'two', 'four');
p('done');
}
addLoadEvent(test);
As for permuting arguments, I have some ideas.. let me think about them a bit.
cheers,
Arnar
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