Recursion- How this function is creating an array?

Tell us what’s happening:
I am not able to understand how the following function is creating an array. The only thing I am able to understand is that the base case is returning an empty array.

function countup(n) {
  if (n < 1) {
    return [];
  } else {
    const countArray = countup(n - 1);
    return countArray;
console.log(countup(5)); // [ 1, 2, 3, 4, 5 ]

Your code so far

// Only change code below this line
function countdown(n){
// Only change code above this line

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.129 Safari/537.36.

Challenge: Use Recursion to Create a Countdown

Link to the challenge:

Do any of these conversations help: