👉 In mathematics, "unfolden" is a function or operation that is often used in computer science to iterate over an array and apply some kind of transformation (such as sorting, filtering, etc.) on each element of the array. The key point here is the application of a function to each element of the array, which can be applied recursively or iteratively. For example, if you have an array `arr` with elements `[1, 2, 3, 4]`, and
