Issue understanding whats the issue

Tell us what’s happening:
My solution is failing, I read this post My method was similar to solution 1 but I think I am missing some key concept here.

Your code so far

// Only change code below this line
function countdown(n){
if(n < 1)
  return [];
return countdown(n-1).unshift(n);
// Only change code above this line

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.125 Safari/537.36.

Challenge: Use Recursion to Create a Countdown

Link to the challenge:

unshift() returns the new length of the array, not the array itself.

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