Form The Largest

/*
Description:
Task
Given a number , Return The Maximum number could be formed from the digits of the number given .

Notes
Only Positve numbers passed to the function , numbers Contain digits [1:9] inclusive  !alt !alt

Digit Duplications could occur , So also consider it when forming the Largest  !alt

Input >> Output Examples:
1- maxNumber (213) ==> return (321)
Explanation:
As 321 is The Maximum number could be formed from the digits of the number 213 .

2- maxNumber (7389) ==> return (9873)
Explanation:
As 9873 is The Maximum number could be formed from the digits of the number 7389 .

3- maxNumber (63729) ==> return (97632)
Explanation:
As 97632 is The Maximum number could be formed from the digits of the number 63729 .

4- maxNumber (566797) ==> return (977665)
Explanation:
As 977665 is The Maximum number could be formed from the digits of the number 566797 .

Note : Digit duplications are considered when forming the largest .

5- maxNumber (17693284) ==> return (98764321)
Explanation:
As 98764321 is The Maximum number could be formed from the digits of the number 17693284 .

Playing with Numbers Series
Playing With Lists/Arrays Series
For More Enjoyable Katas
ALL translations are welcomed
Enjoy Learning !!
Zizou
*/

function maxNumber(n){
  return (''+n).split('').sort((a,b)=>b-a).join('')*1
}