08. Juice Flavors

function produceBottles(input) {
    const juiceQuantity = {};
    const bottlesMap = new Map();

    input.forEach(line => {
        const [juiceName, quantityStr] = line.split(' => ');
        const quantity = +quantityStr;
        juiceQuantity[juiceName] = (juiceQuantity[juiceName] || 0) + quantity;
        while (juiceQuantity[juiceName] >= 1000) {
            bottlesMap.set(juiceName, (bottlesMap.get(juiceName) || 0) + Math.floor(juiceQuantity[juiceName] / 1000));
            juiceQuantity[juiceName] %= 1000;
        }
    });

    for (const [juiceName, bottleCount] of bottlesMap) {
        console.log(`${juiceName} => ${bottleCount}`);
    }
}