How can I remove the items in $b from $a?
$a = "aa","bb","cc","dd","ee"
$b = "bb","dd"
Do you know a good solution?
Thanks!
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What have you tried so far?Jelphy– Jelphy2018-10-03 15:47:56 +00:00Commented Oct 3, 2018 at 15:47
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A foreach loop and comparing each line with if command. I think there should be an easier way.Stoffi– Stoffi2018-10-03 15:49:43 +00:00Commented Oct 3, 2018 at 15:49
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Possible duplicate of Delete items in an array that are in another arrayhenrycarteruk– henrycarteruk2018-10-03 15:56:35 +00:00Commented Oct 3, 2018 at 15:56
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You've actually got two arrays of strings, I assume you didn't know this so couldn't find the answer using the search. I'm voting to close as a duplicate as this has been covered before.henrycarteruk– henrycarteruk2018-10-03 15:58:43 +00:00Commented Oct 3, 2018 at 15:58
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1 Answer
The Compare-Object command is the easiest way of doing this, although it's not very robust, if this is for use in production you may want to roll a more thought-out solution.
$c = Compare-Object -ReferenceObject $a -DifferenceObject $b | ? SideIndicator -eq '<=' | Select -Expand InputObject
Another way which is quite similar but more readable in my opinion is:
$c = $a | ? {$_ -notin $b}
Another way would be using the Group-Object command, and selecting unique entries, but this will include ones which were in $b but NOT in $a.
$c = $a+$b | Group-Object | ? Count -eq 1 | Select -Expand Group
all of these methods will output:
aa
cc
ee
