Get-OrderedVM.ps1

function Get-OrderedVM {
	
	[cmdletbinding()]
	param (
		[parameter(Mandatory = $true, Position = 0)]
		[alias('VM')]
		[String[]]$Name
	)
	
	$finalResult = @()
	
	foreach ($guest in $vms) {
		
		$guestQuery = $null
		
		$guestQuery = Get-VM -Name $guest
		
		$guestQuery += $finalResult
		
	} # end foreach $guest
	
	$finalResult
	
} # end function Get-OrderedVM

$vms = @('vm1', 'vm3', 'vm2', 'vm4')

Get-OrderedVM -Name $vms