Where does the array get created after the else statement?

[FranciscoAndaur]

Where does the array get created after the else statement?

My question is how does javascript know arr is an array? is calling unshift on a variable going to immediately turn that const into an array?

  **Your code so far**

// Only change code below this line
function countdown(n){
if (n > 1) {
  return [];
} else {
  const arr = countdown(n - 1);
  arr.unshift(n);
  console.log(arr)
  return arr;
}
}
// Only change code above this line

  **Your browser information:**

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 11_2_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.90 Safari/537.36.

Challenge: Use Recursion to Create a Countdown

Link to the challenge:

freeCodeCamp.org

[ArielLeslie]

We know that arr is an array because it is declared like this:

  const arr = countdown(n - 1);

The function countdown() always returns an array, so arr is an array.

[FranciscoAndaur]

thank you so much! that helps clear things up.

[ArielLeslie]

I’m glad I could help. Happy coding!