loops - Proper way to create pscustomobject to add to array -

what proper way create / clear / initialize object inside loop using following method/syntax? there performance increases using method.

$objcomputer = [pscustomobject] @{}

i noticed if 1 of systems not exist in ad , returns error or null information previous entry/object used in array. example computer-03 valid blah (which not) pulls previous entry of computer-03.

function get-adcomputers ($namelist) { $arraycomputer = @(); foreach ($line in $namelist.split("`r`n") | ? { $_ }) {     $pcname = $line.trim()     $computer = (get-adcomputer -identity $pcname -properties *)     $objcomputer = [pscustomobject] @{         computer = $pcname         active = $computer.enabled         date = $computer.passwordlastset         daysold = (get-daysold $computer.passwordlastset)         ou =  $computer.distinguishedname     }      write-host $objcomputer     $arraycomputer += $objcomputer     $objcomputer = $null; } return $arraycomputer } 

results

computer    active  date             daysold computer-01 true    4/12/2015 8:16  -29 computer-02 true    5/4/2015 7:11   -7 computer-03 true    4/20/2015 9:01  -21 blah        true    4/20/2015 9:01  -21 computer-03 true    4/6/2015 8:14   -35 computer-04 true    5/9/2015 17:17  -1 computer-05 true    4/17/2015 12:04 -24 

thank help! :)

edit example try catch:

function get-adcomputers ($namelist) { $arraycomputer = @(); foreach ($line in $namelist.split("`r`n") | ? { $_ }) {     $computer = $null     $pcname = $line.trim()     try {         $computer = (get-adcomputer -identity $pcname -properties *)         $objcomputer = [pscustomobject] @{         computer = $pcname         active = $computer.enabled         date = $computer.passwordlastset         daysold = (get-daysold $computer.passwordlastset)         ou =  $computer.distinguishedname         }     } catch {         $objcomputer = [pscustomobject] @{         computer = "$pcname"         active = "missing"         date = "n/a"         daysold = "n/a"         ou =  "n/a"         }     }     write-host $objcomputer     $arraycomputer += $objcomputer     $objcomputer = $null; } return $arraycomputer  } 

if call get-adcomputer fails, $computer not cleared out. you'll need handle error in 1 way or another. simple solution:

$computer = $null $computer = (get-adcomputer -identity $pcname -properties *) if(!$computer) { #handle missing computer      $objcomputer = [pscustomobject] @{         computer = "computer not found"         active = "false"         date = "n/a"         daysold = "n/a"         ou =  "n/a"     }  } 

you can use try/catch block. if don't care much, can use -erroraction silentlycontinue.