04-descending-order.js

/*
Your task is to make a function that can take any non-negative integer as a argument
and return it with it's digits in descending order.
Essentially, rearrange the digits to create the highest possible number.
Examples:
Input: 21445 Output: 54421
Input: 145263 Output: 654321
Input: 1254859723 Output: 9875543221
*/

// #1
export const descendingOrder = (n) => {
  let arr = [];
  const stringN = String(n);
  for (let i = 0; i < stringN.length; i += 1) {
    arr = arr.concat(stringN[i]);
  }
  return Number(arr.sort((a, b) => b - a).join(''));
};

// #2
export const descendingOrder2 = n => Number(String(n).split('').sort((a, b) => b - a).join(''));