Basic JavaScript - Use Recursion to Create a Range of Numbers

[rufatMammadov]

Hi, i wanted to ask about the solution.

function rangeOfNumbers(startNum, endNum) {
  if (endNum < startNum) {
    return [];
  } else {
    const numbers = rangeOfNumbers(startNum, endNum - 1);
    numbers.push(endNum);
    return numbers;
  }
}

In order to push endNum into the numbers array you need to create that array right? But you didn’t. You created a numbers variable, this is what I don’t understand, maybe I don’t get the topic , would you please explain this in some way?

[JeremyLT]

@rufatMammadov

const numbers = rangeOfNumbers(startNum, endNum - 1);

The function rangeOfNumbers() always returns an array.

[rufatMammadov]

Hmm…Why is that? Is there any rule?

[JeremyLT]

It is explicitly what the function is designed to do.

Also, the base case returns an array, and the recursive case returns an array.