PowerShell to Create Custom Object from Existing Object - arrays

Question

I'm attempting to create a custom object from an existing object. However, I can't seem to figure out the best way to go about doing this.
My goal is to create a custom object for each computer name that will have all of the values from Application Name.
I'm not sure if I should use a foreach or a where clause to make this happen and I'm also not sure the correct syntax to use either.
Thanks in advance for any help with this.
The data in the existing object looks like:
Computer Name, IP Address, Application Name
host1,10.10.10.10,firefox
host1,10.10.10.10,chrome
host1,10.10.10.10,internet explorer
host2,11.11.11.11,firefox
host2,11.11.11.11,chrome
host2,11.11.11.11,opera
Code Example:
foreach ($global:ComputerName in $global:SNWReportObject."Computer name"){
if ($_ -eq $global:ComputerName) {
Add-Member -InputObject $global:NEWReportObject -MemberType NoteProperty -Name ApplicationName -Value $global:SNWReportObject."Application name"
}
}
Results I'm hoping for:
Computer Name, Application Name
host1,firefox,chrome,internet explorer
host2,firefox,chrome,opera

Answer 1

Edit:
So your actual case was a bit weird since we're working with arrays of strings in a custom object rather than a hash table. The following code snippet will turn your object into a [HashTable] that is easy to work with. Assumption: all the input data is this well-formed
<# Example.csv
Computer name,IP-Address,Application
host1,10.10.10.10,firefox
host1,10.10.10.10,chrome
host1,10.10.10.10,internet explorer
host2,11.11.11.11,firefox
host2,11.11.11.11,chrome
host2,11.11.11.11,opera
#>
$Csv = Import-Csv -LiteralPath C:\Temp\Example.csv
[HashTable]$Hash=#{}
For ($i = 0; $i -lt ($Csv.'Computer name').Count; $i++)
{
If ($Hash.ContainsKey($Csv.'Computer name'[$i]))
{
$Hash.($Csv.'Computer name'[$i]).Application += $Csv.Application[$i]
Continue
}
$Hash.($Csv.'Computer name'[$i]) = #{
Application = #($Csv.Application[$i])
}
}
Now your members are accessible like so: $Hash.Host1.Application
To get your desired output:
Set-Content -Path C:\Temp\file.csv -Value 'Computer Name,Application Name'
$Hash.Keys |
ForEach-Object
{
Add-Content -Path C:\temp\file.csv -Value "$_,$($Hash.$_.Application -join ',')"
}
When working with a [PSCustomObject], your members are quite limited in what you can do. Here are the standard members (to ignore):
TypeName: System.Management.Automation.PSCustomObject
Name MemberType Definition
---- ---------- ----------
Equals Method bool Equals(System.Object obj)
GetHashCode Method int GetHashCode()
GetType Method type GetType()
ToString Method string ToString()
Knowing this, you can parse through the rest to copy:
$Comp = #('Equals','GetHashCode','GetType','ToString'
[HashTable]$CopyObject=#{}
($Object | Get-Member).Name |
ForEach-Object {
If ($_ -notin $Comp) {$CopyObject.$_ = $Object.$_}
}