Simple Adsearch for emails - powershell

Question

I'm trying to get a list of emails from an ADGroup. The problem is there are members in the group that have no emails and I want the variable to show the ADuser instead of the email if the field is empty.
current code is this
$emails = get-adgroupmember gg-sccm-admins | get-aduser -Properties emailaddress | select emailaddress
$emails+= get-adgroupmember gg-sccm-site_admins | get-aduser -Properties emailaddress | select emailaddress
Write-Output $emails
My idea was to use an IF and if the email field is empty write username in the variable but I can't get it to work.

Answer 1

I guess you could use below:
$emails = get-adgroupmember gg-sccm-admins | Get-ADUser -Properties emailaddress | select #{N="EmailAddress";E={if($_.emailaddress){$_.emailaddress}else{$_.samaccountname}}}
$emails+= get-adgroupmember gg-sccm-site_admins | Get-ADUser -Properties emailaddress | select #{N="EmailAddress";E={if($_.emailaddress){$_.emailaddress}else{$_.samaccountname}}}
Write-Output $emails

Answer 2

Why not just do both?
[System.Collections.ArrayList]$Emails = #()
[System.Collections.ArrayList]$Names = #()
[array]$GroupMembers = Get-ADGroupMember "gg-sccm-admins" | Get-ADUser -Properties emailaddress,DisplayName | Select EmailAddress, DisplayName
Foreach($user in $GroupMembers){
$null = $Emails.Add($User.EmailAddress)
$null = $Names.Add($User.DisplayName)
}
For($i=0;$i -lt $Names.count;$i++){
[pscustomobject]#{
"User Names" = $Names[$i]
"Emails" = $Emails[$i]
}
}
Also, instead of using a fixed array, I changed it to an ArrayList. Should make the process faster as it doesn't have to recreate each array each time with a new item.