Mastering Windows PowerShell Scripting - Third Edition

Selecting elements from the list

As with the array, elements may be selected by index:

$list = New-Object System.Collections.Generic.List[String] 
$list.AddRange([String[]]("Tom", "Richard", "Harry")) 
$list[1]    # Returns Richard 

The generic list offers a variety of methods that may be used to find elements when the index is not known, such as the following:

$index = $list.FindIndex( { $args[0] -eq 'Richard' } ) 

Predicates In the preceding example, ScriptBlock is a predicate. Arguments are passed into ScriptBlock and all list items matching the query are returned. The predicate is similar in syntax to the Where object, except $args[0] is used to refer to the item in the list instead of the pipeline variable, $_. A param block may be declared ...