02. Sum by Town

function solve(arr) {
  const towns = {};

  arr.forEach((el, index) => {
    if (index % 2 === 0) {
      if (!Object.prototype.hasOwnProperty.call(towns, el)) {
        towns[el] = 0;
      }
      towns[el] += Number(arr[index + 1]);
    }
  });

  console.log(JSON.stringify(towns));
}