Reply To: How to process multiple ValidationSet parameter attribute values efficiently?

Well, in this specific case, I'd probably just look at the first letter of each parameter, since you know that they can only be Y/Yes or N/No. That would cut down on half of your conditions:

if ($Param1 -like 'Y*' -and $Param2 -like 'Y*' -and $Param3 -like 'Y*')
{
    # do something
}

The fact that you're defining these parameters as arrays throws a wrench in the works, though… then these conditions are really saying "if any of the elements in the array are Y or Yes for all three arrays, do something."

Personally, I would just use switch parameters here, or at the least, booleans. Those already do a good job of indicating "yes/no" style values (true/false):

function Do-Something
{
    [CmdletBinding()]
    Param
    (
        [switch] $Param1,
        [switch] $Param2,
        [switch] $Param3
    )
 
    if ($Param1 -and $Param2 -and $Param3)
    {
        # Do Something
    }
}