How to know if $variable is User or group

hello all,

i use finding best way know if "name" saved in variable ad user or ad group.

any ideas on how find it?

regards,

arestas

function what-ami($object) {          $user = get-aduser -ldapfilter "(samaccountname=$object)"     if ($user -ne $null) {'user'}     else {         $group = get-adgroup -ldapfilter "(samaccountname=$object)"         if ($group -ne $null) {'group'}         else {             $computer = get-adcomputer -ldapfilter "(samaccountname=$object)"             if ($user -ne $null) {'computer'}             else {'object not found in ad'}         }     } }   what-ami 'the name want check'

or if exsits check $variable.objectclass

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