2

I have a block which parses a list of files from S3 to get the file names.

$GetFileNamesByType = {
    Param(
        $fileType,
        $list
    )

    $entryList = New-Object System.Collections.ArrayList
    foreach($item in $list){
        if($item.Name.Contains($fileType)){
            $entryList.Add($item.Name) | Out-Null
        }
    }

    return $entryList
}

I call this method and it returns me the following list: 

2016-08-31_21-15-17_server-1.1.20558_client-1.1.20518.zip
2016-08-30_21-15-17_server-1.1.20558_client-1.1.20518.zip
2016-08-30_22-15-17_server-1.1.20558_client-1.1.20518.zip
2016-08-30_20-15-17_server-1.1.20558_client-1.1.20518.zip
2016-08-31_23-15-17_server-1.1.20558_client-1.1.20518.zip
2016-08-31_20-15-17_server-1.1.20558_client-1.1.20518.zip
2016-08-30_23-15-17_server-1.1.20558_client-1.1.20518.zip

Howerver, what I don't understand is that when I check the list type, it is an array instead of ArrayList.

Improve this question
5
  • 1
    Possible duplicate of Function not returning expected object Commented Nov 7, 2016 at 22:48
  • You can use foreach as an expression to generate a normal array faster than ArrayList: return foreach ($item in $list) { if($item.Name.Contains($fileType)){$item.Name} } Also, return is optional. Commented Nov 8, 2016 at 3:11
  • @wOxxOm Thanks for the suggestion, the reason I am using ArrayList is that I need to remove the elements in it dynamically. Maybe I should try LinkedList but if it still returns Array, I have to find a workaround. Commented Nov 9, 2016 at 14:41
  • Convert the normal array produced via foreach expression to arraylist in the end: [Collections.ArrayList]$entryList and it'll be still faster! Well, not by much though. Commented Nov 9, 2016 at 14:50
  • @wOxxOm ah, thanks!! It didn't occur me before :) Commented Nov 9, 2016 at 17:21
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