Breakfast Robot

function solution() {
    let robot = {
        ingredients: { protein: 0, carbohydrate: 0, fat: 0, flavour: 0 },
        recipes: {
            apple: { carbohydrate: 1, flavour: 2 },
            lemonade: { carbohydrate: 10, flavour: 20 },
            burger: { carbohydrate: 5, fat: 7, flavour: 3 },
            eggs: { protein: 5, fat: 1, flavour: 1 },
            turkey: { protein: 10, carbohydrate: 10, fat: 10, flavour: 10 }
        },
        restock(microelement, quantity) {
            this.ingredients[microelement] += quantity;
            return 'Success';
        },
        prepare(recipe, quantity) {
            let ingredientsCurrent = {};

            for(let key in this.recipes[recipe]) {
                let neededQuantity = this.recipes[recipe][key] * quantity;

                if(neededQuantity <= this.ingredients[key]) {
                    ingredientsCurrent[key] = this.ingredients[key] - neededQuantity;
                } else {
                    return `Error: not enough ${key} in stock`;
                }
            }

            Object.assign(this.ingredients, ingredientsCurrent);

            return 'Success';
        },
        report() {
            let result = '';
            for(let key in this.ingredients) {
                result += `${key}=${this.ingredients[key]} `;
            }

            result = result.trimEnd();
            return result;
        }
    };

    return (input) => {
        let [command, product, quantity] = input.split(' ');
        quantity = Number(quantity);
        return robot[command](product, quantity);
    };
}

let manager = solution ();
console.log (manager ("prepare turkey 1")); // Error: not enough protein in stock
console.log (manager ("restock protein 10")); // Success
console.log (manager ("prepare turkey 1")); // Error: not enough carbohydrate in stock
console.log (manager ("restock carbohydrate 10")); // Success
console.log (manager ("prepare turkey 1")); // Error: not enough fat in stock
console.log (manager ("restock fat 10")); // Success
console.log (manager ("prepare turkey 1")); // Error: not enough flavour in stock
console.log (manager ("restock flavour 10")); // Success
console.log (manager ("prepare turkey 1")); // Success
console.log (manager ("report")); // protein=0 carbohydrate=0 fat=0 flavour=0