05. Lowest Prices in Cities

function solve(arr) {
  const map = new Map();

  arr.forEach((line) => {
    const [town, product, price] = line.split(' | ');

    if (!map.has(product)) {
      map.set(product, new Map());
    }

    map.get(product).set(town, Number(price));
  });

  for (const [product, insideMap] of map) {
    let lowestPrice = Number.POSITIVE_INFINITY;
    let townWithLowestPrice = '';
    for (const [town, price] of insideMap) {
      if (price < lowestPrice) {
        lowestPrice = price;
        townWithLowestPrice = town;
      }
    }

    console.log(`${product} -> ${lowestPrice} (${townWithLowestPrice})`);
  }
}