Hi,

   i would like to compare 2 arrays in powershell and add the data in one array which is not present in the other, compare-object works good?

Sure, that works for a starting point.

any examples? is there anything like add the data in right which is not present in left to the left?

any examples? is there anything like add the data in right which is not present in left to the left?

No, you'd need to do that yourself based on the output.

Can you throw some light on it pls

Can you throw some light on it pls

You haven't posted any code yet.

$mail1 = mail@xyz.com, mail2@xyz.com

$mail2 = mail@xyz.com , mail3@xyz.com

i want to compare these 2 and add mail3@xyz.com to $mail1

And what problems are you having? What have you tried?

i am yet to try , just started off with compare-object .

i am yet to try , just started off with compare-object .

Post back when you have and we can help you from there.

$mail3 = $mail1 + $mail2 | select -unique

got this working with this, do u think this is a good idea?

Sure, that will do the trick. How large are your source arrays?

it may go upto 300 mail ids

Those should be small enough for what you've posted to work for you.

Here's another method you could use:

Measure-Command {

    $a = @(1..300)
    $b = @(301..600)

    Compare-Object -ReferenceObject $a -DifferenceObject $b | ForEach {

        If ($_.SideIndicator -eq '=>') {

            $a += $_.InputObject

        }

    }

}

Measure-Command {

   $a = @(1..300)
   $b = @(301..600)

   $c = $a + $b | Select -Unique

}


Output:
Days              : 0
Hours             : 0
Minutes           : 0
Seconds           : 0
Milliseconds      : 96
Ticks             : 968313
TotalDays         : 1.12073263888889E-06
TotalHours        : 2.68975833333333E-05
TotalMinutes      : 0.001613855
TotalSeconds      : 0.0968313
TotalMilliseconds : 96.8313

Days              : 0
Hours             : 0
Minutes           : 0
Seconds           : 0
Milliseconds      : 103
Ticks             : 1039414
TotalDays         : 1.20302546296296E-06
TotalHours        : 2.88726111111111E-05
TotalMinutes      : 0.00173235666666667
TotalSeconds      : 0.1039414
TotalMilliseconds : 103.9414

Using an ArrayList would likely be faster, but these are small enough for either of these methods to work.