Mastering Windows PowerShell Scripting - Third Edition

Removing elements from the stack

Elements may be removed from the stack using the Pop method:

$stack.Pop()    # This returns Under the bridge 

If the stack is empty and the Pop method is called, an error will be thrown, as shown here:

PS> $stack.Pop()Exception calling "Pop" with "0" argument(s): "Stack empty."At line:1 char:1+ $stack.Pop()+ ~~~~~~~~~~~~    + CategoryInfo : NotSpecified: (:) [], MethodInvocationException    + FullyQualifiedErrorId : InvalidOperationException 

To avoid this, the Count property of the stack may be inspected, for example:

# Set-up the stack $stack = New-Object System.Collections.Generic.Stack[String] "Up the road", "Over the gate", "Under the bridge" | ForEach-Object { $stack.Push($_) } # Pop from the stack until the ...