Get-ContiguousRange.ps1
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# .SYNOPSIS # Returns the first item or all items of the first contiguous range of items of the specified length # .EXAMPLE # 1..20 | ForEach-Object { Get-ContiguousRange -Items (1..9 + 25..35 + 50..90) -RequiredLength $_ } function Get-ContiguousRange { [CmdletBinding()] Param ( # The items in which the contiguous range is to be found [Parameter(Mandatory, ValueFromPipeline)] [int[]]$Items, # The required number of contiguous items [ValidateRange(1, [int]::MaxValue)] [int]$RequiredLength = 1, # If true, all contiguous items are returned; if false, only the first item in the range is returned [switch]$ReturnAll ) begin { $CachedItems = New-Object -TypeName System.Collections.ArrayList } process { foreach ($Item in $Items) { $CachedItems.Add($Item) | Out-Null } } end { $Index = 0 $Result = $CachedItems | ` ForEach-Object { [pscustomobject]@{ Difference = $_ - $Index; Value = $_; Index = $Index++ } } | ` Group-Object -Property Difference | ` Where-Object -Property Count -GE $RequiredLength | ` Select-Object -First 1 -ExpandProperty Group switch ($ReturnAll) { $true { $Result | Select-Object -First $RequiredLength -ExpandProperty Value } $false { $Result | Select-Object -First 1 -ExpandProperty Value} } } } |