function Hamburger(size, filling) {

        this.checkSize(size);

        this.checkFilling(filling);

        this.size = size;

        this.filling = filling;

        this.extended = [];

}

​

Hamburger.prototype = {

    getCost: function() {

        return Hamburger.prices[this.size] + Hamburger.prices[this.filling] + this.getCostOfExtended();

    },

​

    getCalories: function() {

        return Hamburger.calories[this.size] + Hamburger.calories[this.filling] + this.getCaloriesOfExtended();

    },

    addExtended: function(type) {

        this.checkForSimilarExtended(arguments);

        for (var i = 0; i < arguments.length; i++) {

            this.checkExtended(arguments[i]);

            this.extended.push(arguments[i]);

        }

    },

    getCaloriesOfExtended: function() {

        var caloriesSum = 0;

        for (var n = 0; n < this.extended.length; n++) {

            caloriesSum += Hamburger.calories[this.extended[n]];

        }

        return caloriesSum;

    },

    getCostOfExtended: function() {

        var costSum = 0;

        for (var m = 0; m < this.extended.length; m++) {

            costSum += Hamburger.prices[this.extended[m]];

        }

        return costSum;

    },

    checkForSimilarExtended: function(array) {

        var f=0;

        for (var i=0; i<array.length; i++){

        for (var j=0; j<array.length; j++){

        if(array[i] === array[j] && j != i) {

            f++;

        }   

        }

        }

        if (f > 0) {

            throw new Error('Одинаковые добавки');

        }

    },

    checkSize: function(arg) {

            if (Hamburger.size.indexOf(arg) === -1) {

                throw new Error('Неверные данные');

            }

    },

    checkFilling: function(arg) {

            if (Hamburger.filling.indexOf(arg) === -1) {

                throw new Error('Неверные данные');

            }

    },

    checkExtended: function(arg) {

            if (Hamburger.extended.indexOf(arg) === -1) {

                throw new Error('Неверные данные');

            }

    },

    constructor: Hamburger

};

​

  Hamburger.TYPE_SMALL = 'small';

    Hamburger.TYPE_BIG = 'big';

    Hamburger.FILLING_CHEESE = 'cheese';

    Hamburger.FILLING_SALAD = 'salad';

    Hamburger.FILLING_POTATO = 'potato';

    Hamburger.EXTENDED_SEASONING = 'seasoning';

    Hamburger.EXTENDED_SAUCE = 'sauce';

​

    Hamburger.prices = {};

    Hamburger.size = [Hamburger.TYPE_SMALL, Hamburger.TYPE_BIG];

    Hamburger.filling = [Hamburger.FILLING_CHEESE, Hamburger.FILLING_SALAD, Hamburger.FILLING_POTATO];

    Hamburger.extended = [Hamburger.EXTENDED_SEASONING, Hamburger.EXTENDED_SAUCE];

    Hamburger.prices[Hamburger.TYPE_SMALL] = 50;

    Hamburger.prices[Hamburger.TYPE_BIG] = 100;

    Hamburger.prices[Hamburger.FILLING_CHEESE] = 10;

    Hamburger.prices[Hamburger.FILLING_SALAD] = 20;

    Hamburger.prices[Hamburger.FILLING_POTATO] = 15;

    Hamburger.prices[Hamburger.EXTENDED_SEASONING] = 15;

    Hamburger.prices[Hamburger.EXTENDED_SAUCE] = 20;

    Hamburger.calories = {};

​

    Hamburger.calories[Hamburger.TYPE_SMALL] = 20;

    Hamburger.calories[Hamburger.TYPE_BIG] = 40;

    Hamburger.calories[Hamburger.FILLING_CHEESE] = 20;

    Hamburger.calories[Hamburger.FILLING_SALAD] = 5;

    Hamburger.calories[Hamburger.FILLING_POTATO] = 10;

    Hamburger.calories[Hamburger.EXTENDED_SEASONING] = 0;

    Hamburger.calories[Hamburger.EXTENDED_SAUCE] = 5;

​

var hamburger = new Hamburger(Hamburger.TYPE_SMALL, Hamburger.FILLING_CHEESE);

​

hamburger.addExtended(Hamburger.EXTENDED_SEASONING, Hamburger.EXTENDED_SAUCE);

​

console.log(hamburger.getCost(), hamburger.getCalories());