JSFiddle - React, Tailwind, and code Playground

JavaScript

function Gamburger(size, firstFilling) {
    this.recipe = {};

    if (size == "big") {
        this.size = "big";
        this.cost = 100;
        this.calorificValue = 40;
    } else if (size == "small") {
        this.size = "small";
        this.cost = 50;
        this.calorificValue = 20;
    } else {
        return console.log("неверный размер");
    }

    switch (firstFilling) {
        case "cheese":
            this.addCheese()
            break
        case "salad":
            this.addSalad()
            break
        case "potato":
            this.addPotato()
            break
        case "seasoning":
            this.addSeasoning()
            break
        case "mayonnaise":
            this.addMayonnaise()
            break
        default: return "неправильный первый игридиент"
        break
    }

}

Gamburger.prototype = {
    addCheese: function(obj) {
        this.recipe.cheese = true;
        this.cost += 10;
        this.calorificValue += 20;
    },
    addSalad: function(obj) {
        this.recipe.salad = true;
        this.cost += 20;
        this.calorificValue += 5;
    },
    addPotato: function(obj) {
        this.recipe.potato = true;
        this.cost += 15;
        this.calorificValue += 10;
    },
    addSeasoning: function(obj) {
        this.recipe.seasoning = true;
        this.cost += 15;
    },
    addMayonnaise: function(obj) {
        this.recipe.mayonnaise = true;
        this.cost += 20;
        this.calorificValue += 5;
    }
}


var gam = new Gamburger("small","cheese");

gam.addPotato();