Create a function with optional call variables

Question

Is there a way to create a parameter in a PowerShell function where you have to call it in order to have it considered   An example given by commandlet  the bold being what I want to do    Invoke-Command -computername Server01 -Scriptblock        Here is an example of what I want to do with the function  Function DoStuff  computername  -arg2  -domain  domain      Test-parameter -domain  if  -domain -eq  true            use  domain           Else            domain    Domain1            test-parameter  arg2            if   arg2 -eq  true                Do something                   else               Do the opposite                   So in summary   If  -arg2  is present  I want something to happen in the script  If  -Domain  is present and has an argument with it  I want that to be used rather then the set argument

User · Answer

I don t think your question is very clear  this code assumes that if you re going to include the -domain parameter  it s always  named   i e  dostuff computername arg2 -domain domain   this also makes the computername parameter mandatory   Function DoStuff        param           Parameter Mandatory  true   string  computername           Parameter Mandatory  false   string  arg2           Parameter Mandatory  false   string  domain           if    domain             domain    domain1            write-host  domain     if  arg2           write-host  arg2 present    executing script block            else          write-host  arg2 missing    exiting or whatever

User · Answer

Powershell provides a lot of built-in support for common parameter scenarios  including mandatory parameters  optional parameters   switch   aka flag  parameters  and  parameter sets    By default  all parameters are optional   The most basic approach is to simply check each one for  null  then implement whatever logic you want from there   This is basically what you have already shown in your sample code   If you want to learn about all of the special support that Powershell can give you  check out these links   about Functions  about Functions Advanced  about Functions Advanced Parameters

User · Answer

Not sure I understand the question correctly   From what I gather  you want to be able to assign a value to Domain if it is null and also what to check if  args2 is supplied and according to the value  execute a certain code   I changed the code to reassemble the assumptions made above   Function DoStuff  computername   arg2   domain        if  domain -ne  null                 domain    Domain1             if  arg2 -eq  null                  else                DoStuff -computername  Test  -arg2    -domain  Domain2  DoStuff -computername  Test  -arg2  Test   -domain    DoStuff -computername  Test  -domain  Domain2  DoStuff -computername  Test  -arg2  Domain2    Did that help

[function] Create a function with optional call variables

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