Editing Nested function (section)

=== Functional languages ===

In most [[functional programming]] languages, such as Scheme, nested functions are a [[Programming idiom|common way]] of implementing [[algorithm]]s with loops in them. A simple ([[tail recursion|tail]]) [[recursion|recursive]] inner function is created, which behaves as the algorithm's main loop, while the outer function performs startup actions that only need to be done once. In more complex cases, a number of mutually recursive functions may be created as inner functions.