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Powershell functions can be created as advanced functions. These functions behave very similarly to built-in Powershell cmdlets. Because I can't do without the ability to add a -Verbose or -Debug parameter to my functions now nowadays, these are the only kind of functions I build. Advanced functions, just like "dumb" functions, have parameters. The parameters are the values that are passed into the function from your script.

Now that you've got an understanding of Powershell's advanced functions and the ValidateSet() parameter validation method in the first part of this blog, “Validating Powershell Advanced Function Parameters” you can begin Part #2 of this small post series. Part 2 of this series goes deeper by demonstrating how to dynamically create your sets for ValidateSet() so they aren't hardcoded in. This is essential when dealing with values that may constantly change or even if you just want to practice writing good scripting and have no static references.