We Have Liftoff

We Have Liftoff

// 12/22/2015
// You have an array of numbers 1 through 10 (JS: 1 through 10 or less). The array needs to be formatted correctly for the person 
reading the countdown of a spaceship launch.

// Unfortunately, the person reading the countdown only knows how to read strings. After the array is sorted correctly make 
sure it's in a format he can understand.

// Between each number should be a space and after the final number (1) should be the word 'liftoff!'
// Example:
// Given
// instructions = [8,1,10,2,7,9,6,3,4,5]
// Should return
// "10 9 8 7 6 5 4 3 2 1 liftoff!"
// Given
// instructions = [1,2,4,3,5]
// Should return
// "5 4 3 2 1 liftoff!"

// My Solution:

function liftoff(arr){
  arr=arr.sort(function(a,b){
     return b-a;
  })
  
  var str=""
  str=arr.join(" ")+" liftoff!"
  return str
}

//Refactoring code

function liftoff(arr){
  return arr.sort(function(a,b){
     return b-a;
  }).join(" ") + " Liftoff!"
}