How do I access an array in a powershell function?

Question

I have an array of users. But when I try to access the array in a function it isn't complete.

$script:users = @()

Function check-user{
  foreach($user in $users){
    write-host $user
  }
}

foreach($img in $newImages){
    $users += $username
}

If I check $users it has 2 objects. But when I debug the code and check the function it can only see 1 of those two objects. How do I amend this so PowerShell can see both objects?

@MathiasR.Jessen I just simplified the code for the example. $newImages comes from another away and $username is a variable that is created in the last foreach — deeej
– deeej, Commented Apr 12, 2021 at 9:50
So if you have 10 items in $newImages, you want 10 copies of $username in $users? It's a bit unclear what is supposed to happen here. Please also review this help center article about how to put together simplified examples — Mathias R. Jessen
– Mathias R. Jessen, Commented Apr 12, 2021 at 9:53
Yes that’s correct. When it loops in the function it only seems to be accessing the first object. — deeej
– deeej, Commented Apr 12, 2021 at 9:55

Vivere · Accepted Answer · 2021-04-12 10:00:41Z

2

In your example, you used a scope modifier $Script:users = @() but after that, you don't use the $Script: scope to reference that variable. It could happen that you would have another $users variable but that's unclear from your example.

What you should do is either

be consistent about the scope modifier, i.e. use $Script: everywhere
Use a parameter in your function and pass the $users variable to it

Function check-user{
  [CmdletBinding()] 
  param(
     [Parameter()]
     $Users
  )
  foreach($user in $Users){
    write-host $user
  }
}

# and use it like this
check-user -Users $users

If you are not comfortable with PowerShell, I think you shouldn't be using scopes. Define variables like this: $foo = bar.

answered Apr 12, 2021 at 10:00

Vivere

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