function add(a, b) { 

  var r = 0;

  for(var i in arguments){

    r += arguments[i];

  }

    return r; 

}

​

function partial(arg) {

    var param = Array.prototype.slice.call(arguments, 1);

    return function(){

        return arg.apply(this, param.concat(Array.prototype.slice.call(arguments, 0)));

    }

}

​

var p = partial(add, 2,5);

console.log(p(1,3,1));