Local functions

The use of local functions might seem a little strange at first. They are in fact quite often used in most functional languages. C# 7.0 now allows us to do the same. So what exactly is a local function? Well, think of it as a helper method for a specific method. This helper method only really makes sense when used from the specific method and will not be useful for other methods in your application. It, therefore, makes sense to use it inside your existing method. Some might think that an extension method might be just as well suited, but extension methods should really be used to extend the functionality of many other methods. The usefulness of local functions will become evident in the following code example.