How to Call Functions or Pass Function as Argument

cls
 
function listClusters{
    # List all Clusters in this Domain
    $items=get-cluster -domain (get-addomain)
    $global:clusters=$items
}
 
function show{
    Param($callFunction)
    invoke-command (Get-Item “function:$callFunction”).ScriptBlock
    if ($clusters){$count=$clusters.count; $global:list=$clusters; $global:nodes=””}
    if ($nodes){$count=$nodes.count; $global:list=$nodes}
    
    $show=”`n————————————————–`n    There are $count items in this Collection: `n————————————————–`n”
        for ($row=0;$row -le $count-1;$row++){
            $server=$list[$row]
            $show += “$row”  + “: ” + “$server” + “`n”
            }                
    return $show
}
 
show -callFunction listClusters

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