CityMarkets SortedByName

function solve(input) {
    let summary = new Map();

    for(let row of input) {
        let [town, product, sales] = row.split(' -> ');
        sales = sales.split(' : ').reduce((a, b) => a * b);

        if(!summary.has(town)) {
            summary.set(town, new Map());
        }

        if(!summary.get(town).has(product)) {
            summary.get(town).set(product, 0);
        }

        let oldSales = summary.get(town).get(product);
        summary.get(town).set(product, oldSales + sales)
    }

    //for(let [town, products] of summary) {
    //   console.log(`Town - ${town}`);
    //      for(let [product, sales] of products) {
    //         console.log(`$$$${product} : ${sales}`);
    //      }
    //}

    let sortedTowns = [...summary.entries()].sort(mySort);

    for(let [town, productsMap] of sortedTowns) {
        console.log(town);
        for(let [name, price] of productsMap) {
            console.log(`${name} => ${price}`);
        }
    }

    function mySort(a, b) {
        let aLength = a[0].length;
        let bLength = b[0].length;

        return bLength - aLength;
    }
}

solve(['Sofia -> Laptops HP -> 200 : 2000',
    'Sofia -> Raspberry -> 200000 : 1500',
    'Sofia -> Audi Q7 -> 200 : 100000',
    'Montana -> Portokals -> 200000 : 1',
    'Montana -> Qgodas -> 20000 : 0.2',
    'Montana -> Chereshas -> 1000 : 0.3']);