Get-SlidingAverage.ps1
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function Get-SlidingAverage { [CmdletBinding()] Param( [Parameter(Mandatory,ValueFromPipeline)] [ValidateNotNullOrEmpty()] [array] $InputObject , [Parameter(Mandatory)] [ValidateNotNullOrEmpty()] [string] $Property , [Parameter()] [ValidateNotNullOrEmpty()] [int] $Size = 5 ) Begin { Write-Debug ('[{0}] Size of queue is <{1}>' -f $MyInvocation.MyCommand, $q.Count) $q = New-Object -TypeName System.Collections.Queue -ArgumentList $Size } Process { $InputObject | ForEach-Object { if (($_ | Select-Object -ExpandProperty $Property -ErrorAction 'SilentlyContinue') -eq $null) { throw ('[{0}] Unable to find property <{1}> in input object' -f $MyInvocation.MyCommand, $Property) } #region Enqueue new item and trim to specified size $q.Enqueue($_) Write-Debug ('[{0}] Size of queue is <{1}>' -f $MyInvocation.MyCommand, $q.Count) if ($q.Count -gt $Size) { $q.Dequeue() | Out-Null } #endregion #region Calculate average if the specified number of items is present if ($q.Count -eq $Size) { $q | Microsoft.PowerShell.Utility\Measure-Object -Property $Property -Average | Select-Object -ExpandProperty Average } #endregion } } } New-Alias -Name gsa -Value Get-SlidingAverage -Force |