ForEach is compulsory with Array Parameters which takes Pipline input

[Kriegel]

Hi Mike,

Preparing for my first teaching a class how to script.
I cant say enough how thankfull I am that you share your stuff with us.
Please feel hugged.

The ForEach() Loop is not necessary on all Array Parameters but for those (main Parameter) who takes Pipeline Input, i think it is compulsory.

So i think that we MUST mention it in our teaching.

In your presentation file (see link below) you present the following Code on line 266 without the ForEach() Loop.

function Test-MrParameterValidation { 
     
     [CmdletBinding()] 
    param ( 
         [Parameter(Mandatory)] 
         [string[]]$ComputerName 
     ) 

    Write-Output $ComputerName 
 } 
 
Test-MrParameterValidation 

for a naive this Code looks fine to work, but it is not without the loop!

better is to mention it and present this Code during the whole presentation:

function Test-MrParameterValidation { 
     
     [CmdletBinding()] 
    param ( 
         [Parameter(Mandatory)] 
         [string[]]$ComputerName 
     ) 

    ForEach($Computer in $ComputerName) {
      Write-Output $Computer
    }
 } 
 
Test-MrParameterValidation 

https://github.com/mikefrobbins/Presentations/blob/dev/Gulf%20Coast%20Code%20Camp%202017/PowerShell%20Toolmaking%20with%20Advanced%20Functions%20and%20Script%20Modules.ps1

cheers Peter