Energy Booster

function energyBooster(input) {
    let fruit = input[0];
    let size = input[1];
    let volume = Number(input[2]);
    let sumFruit = 0;

    switch (fruit) {
        case "Watermelon":
            if (size === "small") {
                sumFruit = 56 * 2;
            } else if (size === "big") {
                sumFruit = 28.7 * 5;
            }
            break;

        case "Mango":
            if (size === "small") {
                sumFruit = 36.66 * 2;
            } else if (size === "big") {
                sumFruit = 19.6 * 5;
            }
            break;

        case "Pineapple":
            if (size === "small") {
                sumFruit = 42.1 * 2;
            } else if (size === "big") {
                sumFruit = 24.8 * 5;
            }
            break;

        case "Raspberry":
            if (size === "small") {
                sumFruit = 20 * 2;
            } else if (size === "big") {
                sumFruit = 15.2 * 5;
            }
            break;
    }

    let total = sumFruit * volume;

    if (total >= 400 && total <= 1000) {
        total *= 0.85;
    } else if (total > 1000) {
        total /= 2;
    }

    console.log(`${total.toFixed(2)} lv.`);
}


Фундаменталс решение:


function energyBooster([fruit, size, volume]) {

    let total = {
        "Watermelon": {"small": 112, "big": 143.5},
        "Pineapple": {"small": 84.2, "big": 124},
        "Raspberry": {"small": 40, "big": 76},
        "Mango": {"small": 73.32, "big": 98}
    }[fruit][size] * volume;

    total = total >= 400 && total <= 1000? total * 0.85 : total > 1000 ? total / 2 : total;

    console.log(`${total.toFixed(2)} lv.`);
}