lowestPrice

function lowestPrice(input) {
    let result = new Map();
    for (const line of input) {
        let [townName, productName, productPrice] = line.split(' | ');
        productPrice = +productPrice;
        if (!result.has(productName)) {
            result.set(productName, [townName, productPrice]);
        }
        let oldPrice = result.get(productName)[1];
        if (oldPrice > productPrice) {
            result.set(productName, [townName, productPrice])
        }
    }
    for (const key of result) {
        console.log(`${key[0]} -> ${key[1][1]} (${key[1][0]})`);
    }
}