PowerShell return collection object as duplicates - powershell

Question

Hi apologies if this has been asked before. If so
I have function that builds a object array of group members. I can see it works fine inside the function but the return object is has exactly double the members - tried an ArrayList and that is even worse. Can somebody please explain what is going on....
function Get-MsolGroupMembers
{
[CmdletBinding()]
param
(
[Parameter(Mandatory=$true, Position=0)]
[string]
$SearchString
)
$groups = Get-MsolGroup -SearchString $SearchString -MaxResults 1
$retObjs = #()
Write-Host -fore Yellow $groups.Count 'Group(s) found'
foreach ($group in $groups)
{
$groupGUID = $group.ObjectId
$groupDisplayName = $group.DisplayName
$groupEmail = $group.EmailAddress
$groupType = $group.GroupType
$groupMembers = Get-MsolGroupMember -GroupObjectId $groupGUID -All
foreach ($groupMember in $groupMembers)
{
$Properties = #{"GroupDisplayName"=$groupDisplayName;
"GroupEmail"=$grouEmail;
"GroupType"=$groupType;
"MemberDisplayName"=$groupMember.DisplayName;
"MemberEmail"=$groupMember.EmailAddress;
"MemberType"=$groupMember.GroupMemberType}
$Obj = New-Object -TypeName PSObject -Property $Properties
Write-Output $Obj | select GroupDisplayName,GroupEmail,GroupType,MemberDisplayName,MemberEmail,MemberType
$retObjs += $Obj
}
return $reObjs;
}
}
$members = Get-MsolGroupMembers -SearchString 'My Test Group'
$members.Count

Answer 1

Sure, this is easy. You're outputting everything twice. Once with the Write-Output line, and then again with the return line. PowerShell functions return anything to the pipeline that is not specifically redirected (such as with Write-Host or Export-Csv), so both of those commands essentially do the same thing, which is where your doubling comes from. Remove one or the other and you'll be all set.