Code/Merge-HashTables.ps1


function Merge-HashTables
{
    # I hate suppressing this warning, but I created this cmdlet long before the
    # script analyzer came out. If someone has this in a script, changing the
    # cmdlet name will break them.
    [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSUseSingularNouns", "", Scope="Function")]
    param ($htold=$null, $htnew=$null)
<#
.SYNOPSIS
Merges two has tables based on their keys.
 
.DESCRIPTION
Thanks jon Z!
 
.LINK
http://stackoverflow.com/questions/8800375/merging-hashtables-in-powershell-how
#>

    $keys = $htold.getenumerator() | foreach-object {$_.key}
    $keys | foreach-object {
        $key = $_
        if ($htnew.containskey($key))
        {
            $htold.remove($key)
        }
    }
    $htnew = $htold + $htnew
    return $htnew
}


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