CODEWITHSUNDEEP
arrayslistpowershell
user9217334
user9217334

Reputation:

Using a for loop or cast to create a list

I was researching ways to convert an Array to a List collection and the answer suggested here used casting.

In my script, I constructed a List<string> with a for loop like this:

$backup_details = Get-Content "$env:USERPROFILE\Desktop\source.txt"

$backupItems = New-Object System.Collections.Generic.List[string]

foreach($item in $backup_details){
    $backupItems.Add($item)
}

Is there any reason why I should use casting over this method?

Upvotes: 0

Views: 78

Answers (1)

TheMadTechnician
TheMadTechnician

Reputation: 36297

I feel like you are over complicating things in the pursuit of your goal. As mentioned, you can simply rebuild the array without the first item, or move that item to a different variable.

Remove the item entirely:

$backupItems = $backup_details | Select -Skip 1

(or you could pipe Get-Content to Select -Skip 1 initially and skip that step, or even do $backup_details = $backup_details | Select -Skip 1 to redefine itself)

Move the first item to a different variable, in case you want to keep it for later.

$firstItem, $backupItems = $backup_details

And, (courtesy of Nick's comment, because I didn't think of it), you could just cast it as an ArrayList when you import the data:

[Collections.ArrayList]$backupItems = Get-Content "$env:USERPROFILE\Desktop\source.txt"
$BackupItems.RemoveAt(0)

Upvotes: 1

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