Create Document Set if it does not exist (Powershell)

Question

Adding If doc set does not exist then create doc set. What would be the syntax for looking up document set then create (if does not exists)

### Create new Document Set
$siteURL="http://intra.colgate.com/sites/vendors"
$docLib = "SOA"
$site=Get-SPSite $siteURL
$web=$site.RootWeb
$collFiles=$web.GetFolder($docLib).Files
$count=$collFiles.Count
while($count -ne 0)
{
$item = $collFiles[$count-1].Item
    $DocSetName = $item["Vendor"]
    $newDocumentSet = [Microsoft.Office.DocumentManagement.DocumentSets.DocumentSet]::Create($list.RootFolder,"Document Set Title",$cType.Id,$docsetProperties)

Answer 1

I'm not sure if I'm answering the right question, but I used this method to check if Doc Set (folder) exists, and if not, create:

[Microsoft.SharePoint.SPFolder]$targetFolder = $rootWeb.GetFolder($targetDocLib.RootFolder.ServerRelativeUrl + "/$docSetName")

if (-not $targetFolder.Exists)
{
    # create
}

This approach worked for me.