Mastering Windows PowerShell Scripting - Third Edition

Nesting functions

In the same way that a script can contain functions, a function can contain other functions. This is shown in the following example:

function Outer {    param (        $Parameter1    )    function Inner1 {    }    function Inner2 {    }    Write-Host 'Hello world'}

This technique can be used to isolate small repeated sections of code with a function.

Nested functions must appear before they are used, but otherwise can appear anywhere in the body of the function.

The disadvantage of nesting a function in this manner is that it becomes much harder to test as a unit of code. The function only exists in the context of its parent function; it cannot be called from the scope above that. This is an important consideration when developing a function as part ...