degustationParty.js

function degustationParty(input) {
    let index = 0;
    let line = input[index];
    index++;
    let record = {};
    let dislikedCounter = 0;

    while (line !== "Stop") {
        let [command, username, meal] = line.split('-');
        let collection = [];

        if (command === 'Like') {
            if (!record.hasOwnProperty(username)) {
                record[username] = collection;
                record[username].push(meal);
            } else if (!collection.includes(meal)) {
                record[username].push(meal);
            }
        } else if (command === 'Dislike') {
            if (!record.hasOwnProperty(username)) {
                console.log(username, 'is not at the party.');
            } else if (!record[username].includes(meal)) {
                console.log(`${username} doesn't have the ${meal} in his/her collection.`);
            } else {
                dislikedCounter++;
                let mealIndex = record[username].indexOf(meal);
                record[username].splice(mealIndex, 1);
                console.log(`${username} doesn't like the ${meal}`);
            }
        }

        line = input[index];
        index++;
    }
    for (username in record) {
        console.log(`${username}: ${record[username].join(', ')}`);
    }
    console.log(`Unliked meals: ${dislikedCounter}`);
}

degustationParty(["Like-Krisi-shrimps",
    "Like-Krisi-soup",
    "Like-Penelope-dessert",
    "Like-Misho-salad",
    "Stop"]);

console.log('---');

degustationParty(["Like-Krisi-shrimps",
    "Dislike-Vili-carp",
    "Dislike-Krisi-salad",
    "Stop"]);

console.log('---');

degustationParty(["Like-Katy-fish",
    "Dislike-Katy-fish",
    "Stop"]);