PowerShell How-To Getting Input into Your PowerShell Functions with Parameters Here's a quick walkthrough of how to build function parameters in reusable snippets. By Adam Bertram 04/07/2016 ...

How To Build a Better PowerShell Test-Connection Function with Proxy Commands It's easier to modify an existing cmdlet to your needs than writing one from scratch.

If your automated script takes action based on a value, it's critical to make sure the value is correct. Good thing PowerShell has ways to validate the values that are passed to a function.