function Hamburg(size, filling, extended) {

    this.cost = 0;

    this.calories = 0;

    this.size = size;

    this.filling = filling;

    this.extended = extended;

    this.setProperties = function() {

        if (this.size == 'small') {

            this.cost += 50;

            this.calories += 20;

        } else if (this.size == 'big'){

            this.cost += 100;

            this.calories += 40;

        }

        if (this.filling == 'cheese') {

            this.cost += 10;

            this.calories += 20;

        } else if (this.filling == 'salad') {

            this.cost += 20;

            this.calories += 5;

        } else if (this.filling == 'potato'){

            this.cost += 15;

            this.calories += 10;

        }

        if (this.extended == 'seasoning') {

            this.cost += 15;

        } else if (this.extended == 'sauce'){

            this.cost += 20;

            this.calories += 5;

        }

    };

    this.getResult = function() {

        this.setProperties();

        console.log('Цена: ' + this.cost + ' тугриков', 'Калорий: ' + this.calories);

    };

}

​

var ham = new Hamburg('small', 'cheese');

​

ham.getResult();