ParameterExtensions.ps1

function DefaultValues
{
    Param(
        [Parameter(Position = 0)][string]$Message = "Hello from the standard parameters",
        [Parameter(Position = 1)][string]$SecondMessage = "",
        [Parameter(Position = 2)][bool]$PrintItYellow = $false
    )
    
    if($PrintItYellow)
    {
        Write-Host "$Message $SecondMessage" -ForegroundColor "Yellow"
    }
    else
    {
        Write-Host "$Message $SecondMessage"
    }
}

DefaultValues "Sometimes one parameter" "just will not cut it"
DefaultValues "Sometimes one will be just fine"
DefaultValues -PrintItYellow $true