What is the Linq.First equivalent in PowerShell?

c#, lambda, linq, powershell

Solution

Something like this...

$files = @("App_Data", "bin", "Content")
$line = "drwxr-xr-x 1 ftp ftp              0 Mar 18 22:41 App_Data"
$dir = $files | Where { $line.EndsWith($_) } | Select -First 1

These versions of the last line would all accomplish the same:

$dir = @($files | Where { $line.EndsWith($_) })[0]

$dir = $files | Where { $line.EndsWith($_) } | Select -index 0

$dir = $files | Where { $line.EndsWith($_) } | Select -First 1

It was pointed out that the above is not exactly equivalent in behavior to Linq.First because Linq.First throws exceptions in two cases:

- Throws ArgumentNullException when source or predicate is null.

- Throws InvalidOperationException when source sequence is empty or no element satisfies the condition in predicate.

If you wanted that behavior exactly, you'd need some extra guard code.

Problem

The snippet below detects from a list of files which of them is a Directory on Ftp as C# it will be like below ``` var files = new List<string>(){"App_Data", "bin", "Content"}; var line = "drwxr-xr-x 1 ftp ftp 0 Mar 18 22:41 App_Data" var dir = files.First(x => line.EndsWith(x)); ``` How I can transalte the last line in PowerShell ?

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