Select-As.ps1

function Select-As
{
    [CmdletBinding(DefaultParameterSetName='DefaultParameter', HelpUri='https://go.microsoft.com/fwlink/?LinkID=113387', RemotingCapability='None')]
    param(
        [Parameter(ValueFromPipeline=$true)]
        [psobject]
        ${InputObject},

        [Parameter(Mandatory=$true, Position=0)]
        [System.Object[]]
        ${Property},

        [string[]]
        ${ExcludeProperty},

        [switch]
        ${Unique},

        [Parameter(ParameterSetName='DefaultParameter')]
        [ValidateRange(0, 2147483647)]
        [int]
        ${Last},

        [Parameter(ParameterSetName='DefaultParameter')]
        [ValidateRange(0, 2147483647)]
        [int]
        ${First},

        [Parameter(ParameterSetName='DefaultParameter')]
        [ValidateRange(0, 2147483647)]
        [int]
        ${Skip},

        [Parameter(ParameterSetName='SkipLastParameter')]
        [ValidateRange(0, 2147483647)]
        [int]
        ${SkipLast},

        [Parameter(ParameterSetName='DefaultParameter')]
        [switch]
        ${Wait}
    )

    begin
    {
        $PSBoundParameters['Property'] = foreach($Prop in $Property){
            if($Prop -is [System.Collections.IDictionary] -and $Prop.Count -eq 1){
                @{
                    Name = "$($Prop.Keys[0])"
                    Expression = @($Prop.Values)[0]
                }
            } else {
                $Prop
            }
        }

        try {
            $outBuffer = $null
            if ($PSBoundParameters.TryGetValue('OutBuffer', [ref]$outBuffer))
            {
                $PSBoundParameters['OutBuffer'] = 1
            }
            $wrappedCmd = $ExecutionContext.InvokeCommand.GetCommand('Microsoft.PowerShell.Utility\Select-Object', [System.Management.Automation.CommandTypes]::Cmdlet)
            $scriptCmd = {& $wrappedCmd @PSBoundParameters }
            $steppablePipeline = $scriptCmd.GetSteppablePipeline($myInvocation.CommandOrigin)
            $steppablePipeline.Begin($PSCmdlet)
        } catch {
            throw
        }
    }

    process
    {
        try {
            $steppablePipeline.Process($_)
        } catch {
            throw
        }
    }

    end
    {
        try {
            $steppablePipeline.End()
        } catch {
            throw
        }
    }
    <#

    .ForwardHelpTargetName Microsoft.PowerShell.Utility\Select-Object
    .ForwardHelpCategory Cmdlet

    #>
}