SelectFunctions.ps1
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Function Select-First { [CmdletBinding(DefaultParameterSetName = 'DefaultParameter')] [Alias("First")] param( [Parameter( ParameterSetName = 'DefaultParameter', Mandatory, ValueFromPipeline )] [psobject]$InputObject, [Parameter( ParameterSetName = 'DefaultParameter', Position = 0, Mandatory, HelpMessage = "How many items do you want to select?")] [ValidateRange(0, 2147483647)] [int]$First, [Parameter( Position = 1, ParameterSetName = 'DefaultParameter')] [ValidateNotNullOrEmpty()] [string]$Property, [Parameter(ParameterSetName = 'DefaultParameter')] [ValidateRange(0, 2147483647)] [int]$Skip = 0, [Parameter(ParameterSetName = 'DefaultParameter')] [switch]$Descending ) Begin { Write-Verbose "[BEGIN ] Starting $($MyInvocation.Mycommand)" Write-Verbose "[BEGIN ] Using parameter set $($PSCmdlet.ParameterSetName)" if ($PSBoundParameters.ContainsKey("Property")) { $sortParams = @{Property = $Property} write-verbose "Sorting on $Property" } if ($PSBoundParameters.ContainsKey("Descending")) { if ($sortParams) { $sortParams.Add("Descending", $True) } else { #it is possible to sort without a property say on a string or number $sortParams = @{"Descending" = $True} } } $data = @() Write-Verbose "Selecting first $First, skipping $skip." } #begin Process { #save input objects so they can be sorted $data += $InputObject } #process End { If ($sortparams) { Write-Verbose ($sortParams | out-string) $data = $data | Sort-Object @sortparams } $data | Microsoft.PowerShell.Utility\Select-object -First $first -Skip $skip Write-Verbose "[END ] Ending $($MyInvocation.Mycommand)" } #end } #end function Select-First Function Select-Last { [CmdletBinding(DefaultParameterSetName = 'DefaultParameter')] [Alias("Last")] param( [Parameter( ParameterSetName = 'DefaultParameter', Mandatory, ValueFromPipeline )] [psobject]$InputObject, [Parameter( ParameterSetName = 'DefaultParameter', Position = 0, Mandatory, HelpMessage = "How many items do you want to select?")] [ValidateRange(0, 2147483647)] [int]$Last, [Parameter( Position = 1, ParameterSetName = 'DefaultParameter')] [ValidateNotNullOrEmpty()] [string]$Property, [Parameter(ParameterSetName = 'DefaultParameter')] [ValidateRange(0, 2147483647)] [int]$Skip = 0, [Parameter(ParameterSetName = 'DefaultParameter')] [switch]$Descending ) Begin { Write-Verbose "[BEGIN ] Starting $($MyInvocation.Mycommand)" Write-Verbose "[BEGIN ] Using parameter set $($PSCmdlet.ParameterSetName)" if ($PSBoundParameters.ContainsKey("Property")) { $sortParams = @{Property = $Property} write-verbose "Sorting on $Property" } if ($PSBoundParameters.ContainsKey("Descending")) { if ($sortParams) { $sortParams.Add("Descending", $True) } else { #it is possible to sort without a property say on a string or number $sortParams = @{"Descending" = $True} } } $data = @() Write-Verbose "Selecting Last $Last, skipping $skip." } #begin Process { #save input objects so they can be sorted $data += $InputObject } #process End { If ($sortparams) { Write-Verbose ($sortParams | out-string) $data = $data | Sort-Object @sortparams } $data | Microsoft.PowerShell.Utility\Select-object -Last $Last -Skip $skip Write-Verbose "[END ] Ending $($MyInvocation.Mycommand)" } #end } #end function Select-Last |