About Ordered

OrderedDictionary is made available in PowerShell by using the [Ordered] keyword. This was introduced along with PSCustomObject in PowerShell 3.

An OrderedDictionary preserves the order in which keys were added. For example:

$ordered = [Ordered]@{ One = 1 Two = 2 Three = 3 } 

Viewing the value of $ordered will show the keys appear in the same order they were entered:

PS> $ordered Name Value ---- ----- One 1 Two 2 Three 3 

Conversely, a hashtable may show the keys in a different order:

PS> @{ One = 1; Two = 2; Three = 3 } Name Value ---- ----- Two 2 Three 3 One 1 

In PowerShell 7, a type accelerator exists for [Ordered], which makes the derivation of the type fairly...