uncurrying + mixin in JavaScript

factory.js

// uncurrying and mixin two-in-one
// var a = [1, 2];
// push  = factory(Array.prototype.push);
// pushA = factory(Array.prototype.push, a);
// push(a, 3) => a = [1, 2, 3]
// or
// pushA(3) => a = [1, 2, 3]

var call = Function.call;
var slice = Array.prototype.slice;
function factory() {
    var defaults = slice.call(arguments);

    return function () {
        return call.apply(call, defaults.concat(slice.call(arguments)));
    };
}