Powershell - How to compare two arrays and get difference in another array?

Asked Oct 31 '22 at 14:51

Active Oct 31 '22 at 14:51

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I would like to compare 2 arrays $a and $b. Then I would like to get output(array) of those items from $a that has no pair/match in $b.

$a = "audi","mercedes","bmw","lexus"
$b = "audi","mercedes"

Expected output:

$c = "bmw","lexus"

I'm fairly new in Powershell and I couldn't find answer to this anywhere. I tried to use compare-object, but I got output that I didn't know how to convert to Array.

$c = Compare-Object -ReferenceObject $a -DifferenceObject $b
$c

Is it somehow possible with foreach and if? Thank you for any help!

asked Oct 31 '22 at 14:51

Vojtěch Hanuš

1

since you're just comparing in one direction (`$a` against `$b` and not `$b` against `$a`) then you can just get it using `$a | Where-Object { $_ -notin $b }` – Santiago Squarzon Oct 31 '22 at 14:53
1

well, `[System.Linq.Enumerable]::Except([string[]] $a, [string[]] $b)` would work too – Santiago Squarzon Oct 31 '22 at 14:58
The where-object solution is clever! I will use that, thank you. – Vojtěch Hanuš Oct 31 '22 at 15:07
`compare $a $b | % inputobject` – js2010 Oct 31 '22 at 16:58

Powershell - How to compare two arrays and get difference in another array?

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