js partial application pattern

Partial application

//simple partial application
//--------------------------
var partial = function() {
    var fn = arguments[0];
    var slice = Array.prototype.slice;
    var args = slice.call(arguments, 1);  
    return function() {
      return fn.apply(null, args.concat(slice.call(arguments, 0)));
    };
};

var addMultiple = function() {
     var sum = 0;
    for (var i = 0; i<arguments.length; i++)
        sum += arguments[i];
    return sum;
}

var addSomething = partial(addMultiple, 1);

console.log(addSomething(10, 20));


//partial application (any w/ placeholder)
//----------------------------------------
var partialAny = (function () {

    function partialAny(fn) {
        var slice = Array.prototype.slice;
        var args = slice.call(arguments, 1);



        return function () {
            var actualArgs = [];

            var partial = slice.call(arguments, 0);

            for (var i = 0; i < args.length; i++) {
                actualArgs[i] = (args[i] === partialAny.placeholder) ? partial.shift() : args[i];
            }

            return fn.apply(null, actualArgs.concat(partial))
        }
    }
    partialAny.placeholder = {};
    return partialAny;
}());

function calcHex(a, b, c) {
    return '#' + a + b + c;
}

var __ = partialAny.placeholder;

var setFirstValue = partialAny(calcHex, __, 'ff', 'aa');

console.log(setFirstValue('ca'));