Function.prototype.method = function(name,func){

            if(!this.prototype[name]){

                this.prototype[name] = func;

            }

            return this;

        }

        Function.method('curry', function(){

            var slice = Array.prototype.slice,

                args = slice.apply(arguments),

                that = this;

            return function(){

                return that.apply(null,args.concat(slice.apply(arguments)));

            }

        })

        var add = function(a, b){

            if(typeof a !== 'number' || typeof b !== 'number'){

                throw{

                    name:'TypeError',

                    message:'add needs numbers'

                }

            }

            return a+b;

        }

        var add1 = add.curry(1);

        document.write(add1(6));