How to get all instances of a class? - powershell

Question

My knowledge of classes is relatively new. But I want to output all objects/instances of a class with powershell. Is this even possible? Here is an example of how I create two objects of the class Computer.
Class Computer {
[String]$Name
[String]$Description
[String]$Type
}
$NewComputer = New-Object 'Computer'
$NewComputer.Name = 'ultra1'
$NewComputer.Description = 'Lenovo Yoga 900'
$NewComputer.Type = 'Ultrabook'
$NewComputer = New-Object 'Computer'
$NewComputer.Name = 'ultra2'
$NewComputer.Description = 'Lenovo Yoga X1'
$NewComputer.Type = 'Ultrabook'
Now I want to output both objects, how can I do this?

Answer 1

Judging from your comment "if there is a possibility to get the objects of a class without putting them into a collection", I think what you want to do is to create new Computer objects using your class and later on use these objects as separate variables.
For easier creation, I'd suggest you add a constructor to the class, so you can create the objects in a single line:
Class Computer {
[String]$Name
[String]$Description
[String]$Type
# add a constructor
Computer(
[string]$n,
[string]$d,
[string]$t
){
$this.Name = $n
$this.Description = $d
$this.Type = $t
}
}
# now create the computer objects
[Computer]$pcUltra1 = [Computer]::new('ultra1','Lenovo Yoga 900','Ultrabook')
[Computer]$pcUltra2 = [Computer]::new('ultra2','Lenovo Yoga X1','Ultrabook')
# show what you have now
$pcUltra1
$pcUltra2
Output:
Name Description Type
---- ----------- ----
ultra1 Lenovo Yoga 900 Ultrabook
ultra2 Lenovo Yoga X1 Ultrabook
Hope that helps

Answer 2

Maybe this will help
Class Computer {
[String]$Name
[String]$Description
[String]$Type
}
# a collection of computers
$computers =#()
$NewComputer = New-Object 'Computer'
$NewComputer.Name = ‘ultra1’
$NewComputer.Description = ‘Lenovo Yoga 900’
$NewComputer.Type = ‘Ultrabook’
# append a computer to teh collection
$computers += $NewComputer
$NewComputer = New-Object 'Computer'
$NewComputer.Name = ‘ultra2’
$NewComputer.Description = ‘Lenovo Yoga X1’
$NewComputer.Type = ‘Ultrabook’
# append a computer to teh collection
$computers += $NewComputer
# this outputs each of the computers
$computers
# or you can format the data in a table
$computers | Format-Table -AutoSize
# or in a list
$computers | Format-List *
# or as json
$computers | ConvertTo-Json

Answer 3

Assuming you haven't re-bound any names, you can do the following:
Get-Variable | Select-Object -ExpandProperty Value |
Where-Object { $_.GetType().Name -eq 'Computer' }