Provides a filter to retrieve the last-published list items on SharePoint Lists.

sp-selectlastpublishedversionitem.cs

/**
 * SP-SelectLastPublishedVersionItem.cs
 *
 * (c) 2018 koohq. Licensed under CC0.
 * https://creativecommons.org/publicdomain/zero/1.0/legalcode
 */
namespace Kooh.Q.Hook
{
    using Microsoft.SharePoint;
    
    public static class SPXtension
    {
        /// <summary>
        /// Select the last-published items from target items.
        /// </summary>
        /// <param name="items">source items</param>
        /// <returns>An IEnumerable of SPListItem that is last-published</returns>
        public static IEnumerable<SPListItem> SelectLastPublishedVersionItem(this SPListItemCollection items)
        {
            return items.OfType<SPListItem>()
                .Where(x => x.HasPublishedVersion)
                .Select(x => 
                    x.Versions.OfType<SPListItemVersion>()
                        .First(x => x.Level == SPFileLevel.Published)
                        .ListItem
                );
        }
    }
}

sp-selectlastpublishedversionitem.ps1

<##
 # SP-SelectLastPublishedVersionItem.ps1
 #
 # (c) 2018 koohq. Licensed under CC0.
 # https://creativecommons.org/publicdomain/zero/1.0/legalcode
 #>
filter Select-LastPublishedVersionItem
{
    [CmdletBinding()]
    param(
        [Parameter(Mandatory=$true,ValueFromPipeline=$true)]
        $Items
    )

    $Items |
    where HasPublishedVersion |
    foreach { ($_.Versions | where Level -EQ "Published" | select -First 1).ListItem }
}