Need to Understand 2 Scripting parameters

Question

Hi, 
Can someone tell me what this is doing in script of ActiveSync stats:
$EASDevices = “”
$AllEASDevices = @()
The complete script is:
####  Get Mailbox
$EASDevices = “”
$AllEASDevices = @()
$EASDevices = “”| select ‘User’,'PrimarySMTPAddress’,'DeviceType’,'DeviceModel’,'DeviceOS’, ‘LastSyncAttemptTime’,'LastSuccessSync’
$EasMailboxes = Get-Mailbox -ResultSize unlimited
foreach ($EASUser in $EasMailboxes) {
$EASDevices.user = $EASUser.displayname
$EASDevices.PrimarySMTPAddress = $EASUser.PrimarySMTPAddress.tostring()
    foreach ($EASUserDevices in Get-ActiveSyncDevice -Mailbox $EasUser.alias) {
    $EASDeviceStatistics = $EASUserDevices | Get-ActiveSyncDeviceStatistics
    $EASDevices.devicetype = $EASUserDevices.devicetype
    $EASDevices.devicemodel = $EASUserDevices.devicemodel
    $EASDevices.deviceos = $EASUserDevices.deviceos
    $EASDevices.lastsyncattempttime = $EASDeviceStatistics.lastsyncattempttime
    $EASDevices.lastsuccesssync = $EASDeviceStatistics.lastsuccesssync
    $AllEASDevices += $EASDevices | select user,primarysmtpaddress,devicetype,devicemodel,deviceos,lastsyncattempttime,lastsuccesssync
$AllEASDevices = $AllEASDevices | sort user
$AllEASDevices
$AllEASDevices | Export-Csv $exportpath\ActiveSyncReport.csv
Hasan

Answer 1

They are just creating empty varibles so that data can be added to them later in the script.
The first one
$EASDevices = “”
creates an empty string.
the second one
$AllEASDevices = @()
creates an empty array.
DJ Grijalva | MCITP: EMA 2007/2010 SPA 2010 | www.persistentcerebro.com
Hi DJ, 
What is the purpose of empty string. 
Hasan