const INGREDIENT_PRICES = {
salad: 5,
cheese: 10,
meat: 20,
bacon: 10

state ={
    ingredients: {
        salad: 0,
        bacon : 0,
        cheese: 0,
        meat: 0
    },
    totalPrice: 30,
    purchaseble: false
}

addIngredientHandler = (type) => {
    const oldCount = this.state.ingredients[type];
    const updatedCount = oldCount +1;
    const updatedIngredients = {
        ...this.state.ingredients
    };
    updatedIngredients[type] = updatedCount;
    const priceAddition = INGREDIENT_PRICES[type];
    const newPrice = this.state.totalPrice + priceAddition
    this.setState({totalPrice: newPrice, ingredients: updatedIngredients})
    this.updatePurchaseState();
}