WeHaveLiftoff.js

// You have an array of numbers 1 through n (where 1 <= n <= 10). 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 (n) should be the word 'liftoff!'


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

liftoff([2, 8, 10, 9, 1, 3, 4, 7, 6, 5]);