function Test-Pipeline {
    $pipelineData = @($Input)
    $Count = $pipelineData.Count
    “Received $Count elements: $pipelineData”
}

PS> 1..10 | Test-Pipeline
Received 10 elements: 1 2 3 4 5 6 7 8 9 10

function Test-Pipeline {
    $Count = $Input.Count
    “Received $Count elements: $Input”
}

PS> 1..10 | Test-Pipeline
Received 1 1 1 1 1 1 1 1 1 1 elements: