Remove duplicate items in object but not all of it - powershell

Question

How can I remove duplicates before exporting to a csv?
foreach ($group in $ADGroups) {
$ADResult += [PSCustomObject]#{
ADGroup = $group.name
ADuser = $user.name
}
#Remove-ADGroupMember -Identity $Group.DistinguishedName -Members $UserInfo.DistinguishedName -Confirm:$false
$group = $null
}
In the above bit of code the result comes out like
aduser | adgroup
x | a
x | s
x | v
The aduser is the same for each group. How can I post the user once
so it comes out like the following without the duplicate user?
aduser | adgroup
x | a
| s
| v

Answer 1

This will create the output as you requested. You'll lose the ability to sort and filter if you plan to work with the output data in Excel but it's your choice.
#Users Group Membership
$ADGroups = Get-ADGroup -Filter *
$groupMembership = foreach ($group in $ADGroups) {
$members = Get-ADGroupMember -Identity $group | Where-Object { $_.objectClass -eq 'user' }
foreach ($member in $members) {
[PSCustomObject]#{
ADuser = $member.name
ADGroup = $group.name
}
}
}
#Get Unique Users
$usersUnique = $groupMembership | Select-Object -Property ADuser -Unique | Sort-Object -Property ADuser
#Loop each Unique user and add a new NoteProperty ADuser2. This will be populated with ADuser if its the first occurrence, else blank.
$results = foreach ($user in $usersUnique) {
$firstOccurrence = $true
$userMembership = $groupMembership | Where-Object { $_.ADuser -eq $user.ADuser } | Sort-Object -Property ADGroup
foreach ($membership in $userMembership) {
if ($firstOccurrence) {
$membership | Add-Member -MemberType NoteProperty -Name ADuser2 -Value $user.ADuser -PassThru
$firstOccurrence = $false
}
else {
$membership | Add-Member -MemberType NoteProperty -Name ADuser2 -Value "" -PassThru
}
}
}
#Export to CSV
$results | Sort-Object -Property ADuser, ADGroup | Select-Object ADuser2, ADGroup | Export-Csv -Path C:\support\user-group_membership_report.csv -NoTypeInformation

Answer 2

I would go with something like this:
$i = 0
foreach ($group in $ADGroups) {
if($i -eq 0){
$ADResult += [PSCustomObject]#{
ADGroup = $group.name
ADuser = $user.name
}
$i = 1
}
else {
$ADResult += [PSCustomObject]#{
ADGroup = $group.name
ADuser = ""
}
}
}