Azure Powershell Script - azure

Question

I have written a PowerShell script to print VM names with unmanaged disks however it's giving me an error. Appreciate any help on this -
$location=Read-Host -Prompt 'Input location for VMs'
$azuresubscription=Read-Host -Prompt 'Input Subscription Id'
$rmvms=Get-AzurermVM
# Add info about VM's from the Resource Manager to the array
foreach ($vm in $rmvms)
{
# Get status (does not seem to be a property of $vm, so need to call Get-AzurevmVM for each rmVM)
$vmstatus = Get-AzurermVM -Name $vm.Name -ResourceGroupName $vm.ResourceGroupName -Status | where Location -like $location
# Add values to the array:
$vmarray += New-Object PSObject -Property #{`
# Subscription=$Subscription.SubscriptionName; `
Subscription=$azuresubscription.SubscriptionName; `
AzureMode="Resource_Manager"; `
Name=$vm.Name; PowerState=(get-culture).TextInfo.ToTitleCase(($vmstatus.statuses)[1].code.split("/")[1]); `
Size=$vm.HardwareProfile.VirtualMachineSize}
}
foreach ($vm in $vmarray)
{
$vmdiskstatus = (Get-AzurermVM -Name $vm.Name -ResourceGroupName $vm.ResourceGroupName).StorageProfile.OsDisk.ManagedDisk
if (!$vmdiskstatus) {Write-Host $vm.Name}
}
Error Message:
($vmarray is resulting in Null array) -
Cannot index into a null array.
Expected Output - $vmarray should have one VM as there is a running
instance in eastus (that's what I am using as value for $location)

Answer 1

As requested by Victor Silva to add my comment as answer, here goes:
You need to define the $vmarray as array before entering the loop to add objects to it.
Then, after that loop, the foreach ($vm in $vmarray) does have an array to index into, even if empty:
$location=Read-Host -Prompt 'Input location for VMs'
$azuresubscription=Read-Host -Prompt 'Input Subscription Id'
$rmvms=Get-AzurermVM
###################################################
# create an array variable to collect the result(s)
###################################################
$vmarray = #()
# Add info about VM's from the Resource Manager to the array
foreach ($vm in $rmvms)
{
# rest of your code
}