05. Small Shop

Решение с if-else:

function smallShop(input) {
    let product = input[0];
    let town = input[1];
    let quantity = parseFloat(input[2]);
    let sum = 0;

    if (town === "Sofia") {
        if (product === "coffee") {
            sum = 0.5;
        } else if (product === "water") {
            sum = 0.8;
        } else if (product === "beer") {
            sum = 1.2;
        } else if (product === "sweets") {
            sum = 1.45;
        } else if (product === "peanuts") {
            sum = 1.6;
        }
    } else if (town === "Plovdiv") {
        if (product === "coffee") {
            sum = 0.4;
        } else if (product === "water") {
            sum = 0.7;
        } else if (product === "beer") {
            sum = 1.15;
        } else if (product === "sweets") {
            sum = 1.30;
        } else if (product === "peanuts") {
            sum = 1.5;
        }
    } else if (town === "Varna") {
        if (product === "coffee") {
            sum = 0.45;
        } else if (product === "water") {
            sum = 0.7;
        } else if (product === "beer") {
            sum = 1.1;
        } else if (product === "sweets") {
            sum = 1.35;
        } else if (product === "peanuts") {
            sum = 1.55;
        }
    }
    console.log(sum * quantity);
}

Решение със if-else и switch:

function smallShop(input) {
    let product = input[0];
    let town = input[1];
    let quantity = parseFloat(input[2]);
    let sum = 0;

    if (town === "Sofia") {
        switch (product) {
            case "coffee":
                sum = 0.5;
                break;
            case "water":
                sum = 0.8;
                break;
            case "beer":
                sum = 1.2;
                break;
            case "sweets":
                sum = 1.45;
                break;
            case "peanuts":
                sum = 1.6;
                break;
        }
    } else if (town === "Plovdiv") {
        switch (product) {
            case "coffee":
                sum = 0.4;
                break;
            case "water":
                sum = 0.7;
                break;
            case "beer":
                sum = 1.15;
                break;
            case "sweets":
                sum = 1.30;
                break;
            case "peanuts":
                sum = 1.5;
                break;
        }
    } else if (town === "Varna") {
        switch (product) {
            case "coffee":
                sum = 0.45;
                break;
            case "water":
                sum = 0.7;
                break;
            case "beer":
                sum = 1.1;
                break;
            case "sweets":
                sum = 1.35;
                break;
            case "peanuts":
                sum = 1.55;
                break;
        }
    }
    console.log(sum * quantity);
}

Тарикатско за напреднали:)

function smallShop(input) {
    let product = input[0];
    let town = input[1];
    let quantity = parseFloat(input[2]);
    let products = {};

    if (town === "Sofia") {
        products = { 'coffee': 0.5, 'water': 0.8, 'beer': 1.2, 'sweets': 1.45, 'peanuts': 1.6 };
    } else if (town === "Plovdiv") {
        products = { 'coffee': 0.4, 'water': 0.7, 'beer': 1.15, 'sweets': 1.3, 'peanuts': 1.5 };
    } else if (town === "Varna") {
        products = { 'coffee': 0.45, 'water': 0.7, 'beer': 1.1, 'sweets': 1.35, 'peanuts': 1.55 };
    }
    console.log(products[product] * quantity);
}

Или с тернарен оператор:

function smallShop(input) {
    let product = input[0];
    let town = input[1];
    let quantity = parseFloat(input[2]);

    let products = town === "Sofia" ? { 'coffee': 0.5, 'water': 0.8, 'beer': 1.2, 'sweets': 1.45, 'peanuts': 1.6 } :
                   town === "Plovdiv" ? { 'coffee': 0.4, 'water': 0.7, 'beer': 1.15, 'sweets': 1.3, 'peanuts': 1.5 } :
                   town === "Varna" ? { 'coffee': 0.45, 'water': 0.7, 'beer': 1.1, 'sweets': 1.35, 'peanuts': 1.55 } : 0;

    console.log(products[product] * quantity);
}