Named parameters application of a function

gistfile1.js

/**
 * Applies a set of named arguments to a `func`.
 *
 * Example: var f = function(x, y, z) { return x * (y - z); };
 *          namedApply(f, {x: 1, y: 2, z: 3});
 * 
 * @param func {Function} A function to invoke.
 * @param args {Object} A collection of named arguments.
 * @return {Function} A new function with partially applied named arguments.
 */
function namedApply(func, args) {
    var len = Object.getOwnPropertyNames(args).length;
    func.apply(this, func.toString().match(/\((.*?)\)/)[1].split(", ").map(function(name, i) {
        if (i > len) throw TypeError("`args` object has more properties than parameters in a function.");
        return args[name];
    }));
}