Type accelerators are shortcut names that represent .NET types. For example, you can use [XML] instead of [System.Xml.XmlDocument]. By default, PowerShell only contains type accelerators for the most common .NET types but you can easily add more.
The following sample adds a type [SuperArray] which is a shortcut to [System.Collections.ArrayList] and creates a super-charged array: it has methods to insert and add new elements, speeding up array-manipulation tremendously:
PS> $accelerator = [type]::gettype("System.Management.Automation.TypeAccelerators") PS> $accelerator::Add('SuperArray', [System.Collections.ArrayList]) PS> $arr = [SuperArray](1,2,3,4,5) PS> $arr.Insert(1,12) PS> $arr 1 12 2 3 4 5
Note that this trick will no longer work in PowerShell v3 unfortunately.