new-object psobject add value - object

Question

I understand that custom objects are created like this :
$obj=new-object psobject
and then I understand that you can add members (and values) like this :
$obj | Add-Member noteproperty name Jeff
Now the question is, how do you populate the object, add and remove "rows" of values ?
The only way around I found is to create an array and then push objects inside it, like this :
$array = #()
$array+=new-object PSObject -Property #{Name="Jeff"}
$array+=new-object PSObject -Property #{Name="Joe"}
$array+=new-object PSObject -Property #{Name="John"}
etc..
Is there a straight forward way to "increment" the values of the members in an object ?
$obj+=(Name=John)
doesn't work.
Thanks

Answer 1

A very late response, but I hope it helps someone who needs to count objects.
Let's start with a list of users we wish to count.
> $users = 1..10 | % {New-object psobject -Property #{ Name = "User $_"; Age = $_ } }
> $users
Age Name
--- ----
1 User 1
2 User 2
3 User 3
4 User 4
5 User 5
6 User 6
7 User 7
8 User 8
9 User 9
10 User 10
To count them, put them into a hash table of counters
> # Create hash table
> $counter = #{}
> # Assign users as keys in the table
> $users | % { $counter.Add($_, 0) }
> $counter
Name Value
---- -----
#{Age=4; Name=User 4} 0
#{Age=1; Name=User 1} 0
#{Age=3; Name=User 3} 0
#{Age=5; Name=User 5} 0
#{Age=10; Name=User 10} 0
#{Age=9; Name=User 9} 0
#{Age=8; Name=User 8} 0
#{Age=7; Name=User 7} 0
#{Age=6; Name=User 6} 0
#{Age=2; Name=User 2} 0
Then you can increment the counter whenever you encounter
the user in your script. For example, to increment "User 1" twice
and "User 4" once
> $counter[$users[0]] += 1
> $counter[$users[0]] += 1
> $counter[$users[3]] += 1
> $counter
Name Value
---- -----
#{Age=4; Name=User 4} 1
#{Age=1; Name=User 1} 2
#{Age=3; Name=User 3} 0
#{Age=5; Name=User 5} 0
#{Age=10; Name=User 10} 0
#{Age=9; Name=User 9} 0
#{Age=8; Name=User 8} 0
#{Age=7; Name=User 7} 0
#{Age=6; Name=User 6} 0
#{Age=2; Name=User 2} 0

Answer 2

In your example above, I believe you end up with a System.Management.Automation.PSCustomObject, not an array. I use something similar to what you're doing when I build reports that contain custom objects. If you're really just using that to store one property, though, it's probably overkill. You could just do something like this:
$names += "John"
$names += "Fred"
In the case that you really want to add new note properties to an object throughout a script, this is how I do it. Keep in mind PowerShell doesn't like to add note properties with the same name, so if you do that you'll have to simply set the property with =
Here's an example of what I do:
$params += #{Name = $_.Name}
$params += #{Calculation = $someCalculatedValue}
$collection += New-Object -Type PSObject -Property $params