nullornonull.ps1

$TestSize = 500kb
$LargeArrayList = New-Object -TypeName "System.Collections.ArrayList"


$AllTests = foreach($i in (1..$TestSize)){
    $Guid = ((New-Guid).ToString())

    [PSCustomObject]@{
        TestName = 'Out-Null'
        TestResult = (Measure-Command {
            $LargeArrayList.Add([PSCustomObject]@{
                Guid = $Guid
            }) | Out-Null
        }).TotalMilliseconds
    }
    [PSCustomObject]@{
        TestName = 'void'
        TestResult = (Measure-Command {
            [void]$LargeArrayList.Add([PSCustomObject]@{
                Guid = $Guid
            })
        }).TotalMilliseconds
    }
    [PSCustomObject]@{
        TestName = '$null'
        TestResult = (Measure-Command {
            $null = $LargeArrayList.Add([PSCustomObject]@{
                Guid = $Guid
            })
        }).TotalMilliseconds
    }
}
$Result = $AllTests | Group-Object -Property TestName | ForEach-Object {
    [PSCustomObject]@{
        TestName = $_.Name
        AverageTime = ($_.Group | Measure-Object -Property TestResult -Maximum -Minimum -Average)
    }
}
$Finaloutput = $Result | Select-Object -Property TestName, @{Name='AverageTime';Expression={"{0:N2}" -f $_.AverageTime.Average}}, @{Name='MaximumTime';Expression={"{0:N2}" -f $_.AverageTime.Maximum}}, @{Name='MinimumTime';Expression={"{0:N2}" -f $_.AverageTime.Minimum}}