👉 In mathematics, "folden" is a function that takes an input argument and returns an output argument. This operation can be defined recursively or iteratively depending on the context of the problem. For example: - If we have an array `A` of length `n`, then the function `f(n)` will return `A[1]`. - In other words, if we iterate over a list of items and apply a specified operation to each item, the output can be obtained by
