garage

garage = (input) => {
    let garages = {};
    input.forEach(line => {
        let split = line.split(' - ');
        let num = split.shift();
        let car = {};
        split.shift().split(', ').map(part => part.split(': ')).forEach(el => {
            car[el[0]] = el[1];
        });
        if(garages[num] !== undefined) {
            garages[num].push(car);
        } else {
            garages[num] = [ car ];
        }
    });

    Object
    .entries(garages)
    .sort((a, b) => b[1].length - a[1].length)
    .forEach(([garage, cars]) => {
        console.log(`Garage № ${garage}`);
        cars.forEach(car => {
            let output = '';
            for(key in car) {
                output += `, ${key} - ${car[key]}`;
            }
            output = '---' + output.substr(1);
            console.log(output);
        });
    });
}