Comparing two variable properties

I have 2 variables with the same property values ( computername) . I wish to find the value that does not match . So below , I have my list of computers in var pageresponse in a invoke-webrequest stored variable .

$pageresponse.pscomputername

iasc9-web04
iasc9-web05
iasc9-web06
iasc9-web07
iasc9-web15
iasc9-web16
iasc9-web25
iasc9-web26
iasc9-web27
iasc9-web28
iasc9-web29
iasc9-web30
iasc9-web31
iasc9-web32
iasc9-web33

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And , i also have a list of "started" computers in a stored variable of var publicstarted of property $publicstarted.pscomputername

$publicstarted.pscomputername
iasc9-web04
iasc9-web05
iasc9-web06
iasc9-web07
iasc9-web15
iasc9-web16
iasc9-web25
iasc9-web26
iasc9-web27
iasc9-web28
iasc9-web29
iasc9-web30
iasc9-web31
iasc9-web32
iasc9-web33
iasc9-web34

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So I just wish to compare the 2 and return the value that is not matching , so in this example, iasc9-web34 should be returned and stored in a new var.

Your help is appreciated.
davesnbAsked:
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Qlemo"Batchelor", Developer and EE Topic AdvisorCommented: 
$diff = $pageresponse.pscomputername | ? { $_ -notin $publicstarted.pscomputername }

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footechCommented:
I'm going to assume that $pageresponse and $publicstarted are object arrays that each have a pscomputername property.
$diff = Compare-Object -ReferenceObject $pageresponse -DifferenceObject $publicstarted -Property pscomputername | Select -ExpandProperty PsComputerName

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This will work whether there are extra items in either array.

However, if $pageresponse and $publicstarted aren't object arrays, then the approach would have to be changed.  For example, if $pageresponse is a single object, and its pscomputername property is a multiline string, or a string array.  To check, try providing the result of the following:
$pageresponse.GetType()
$pageresponse | gm

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davesnbAuthor Commented:
Yes, thank you the first worked !
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