ex.js

function print(str) {
document.getElementById('resultzone').innerHTML += `<br><b>${JSON.stringify(str)}</b>`;
}


const seperateNumbers = function(arr) {
  const evenNumbers = [];
  const oddNumbers = [];
  for (let i = 0; i < arr.length; i++) {
    (arr[i] % 2 === 0) ? evenNumbers.push(arr[i]) : oddNumbers.push(arr[i]);
  }
  return ([evenNumbers.sort().reverse(), oddNumbers.sort().reverse()]);
}

print(seperateNumbers([-1,-2,1,0,2,5,6,2,6,7]));