function descendingOrder(n){
  let x= n.toString();
  let arr = x.split('');
  let N = arr.length;
  
  if (n.length === 1) {
    return parseInt(n, 10);
  }
  
  for (let i = 0; i < N; i++) {
    
    for (let j = 0; j < N-i-1; j++) {
       if (arr[j] < arr[j+1]) {
        let k = arr[j];
        arr[j] = arr[j+1];
        arr[j+1] = k;
      }
    }
  }
 
 	n = arr.join('');
  n = parseInt(n, 10);
  return n;
}

const main = () => {
  const links = [
    'https://www.uol',
    'https://www.bol.com.br',
    'https://www.uol',
    'https://noticias.uol.com.br',
    'https://www.bol.com.br',
  ];
  
  // converter para ES6
  function uniqueLinks (links){
    return uniqueLinks.length;
  }
};

function reverseInt(n) {
    let reversed = 0;
    
    while(n >= 0){
      reversed = reversed * 10 + (n % 10);
      n /= 10;
    }
    
    return reversed;
  }
}