Chapters/scripting-at-scale/SquareRoot.ps1
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Function SquareRoot { [cmdletbinding()] Param( [Parameter(Position = 0, Mandatory,ValueFromPipeline)] [int[]]$Value ) Begin { Write-Verbose "[BEGIN ] Starting: $($MyInvocation.Mycommand)" } #begin Process { foreach ($item in $value) { [pscustomobject]@{ Value = $item SquareRoot = [math]::Sqrt($item) } } } #process End { Write-Verbose "[END ] Ending: $($MyInvocation.Mycommand)" } #end } <# test performance $n = 1..1000 measure-command { $n | squareroot} measure-command { squareroot $n } 10,100,500,1000,5000,10000 | foreach { $n = 1..$_ $pipe = (measure-command { $n | squareroot}).totalMilliseconds $param = (measure-command {squareroot $n}).TotalMilliseconds [pscustomobject]@{ ItemCount = $_ PipelineMS = $pipe ParameterMS = $param PctDiff = 100 - (($param/$pipe) * 100 -as [int]) } } #> |