Add to array without echoing index

Question

I'm adding items to an array called $MissingIps using the following command

$MissingIps = @("")
[System.Collections.ArrayList]$ExistingIps = $MissingIps
if ($lbips -notcontains $awsip){
    $MissingIps.Add("$awsip")
}

On execution, PowerShell automatically echos the index position, and I'm struggling to hide that.

Any ideas?

Ansgar Wiechers · Accepted Answer · 2017-07-14 09:35:41Z

2

As an alternative to the suggested methods of suppressing the unwanted output: don't use an ArrayList collection in the first place. It's the Add() method of that class that generates the output. If you use a regular array you can append without output being generated:

$MissingIps = @()
if ($lbips -notcontains $awsip){
    $MissingIps += $awsip
}

edited Jul 14, 2017 at 9:35

answered Jul 14, 2017 at 9:16

Ansgar Wiechers

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Comments

Ranadip Dutta · Accepted Answer · 2017-07-14 09:00:55Z

1

This will do the work:

$MissingIps = @("")
    [System.Collections.ArrayList]$ExistingIps = $MissingIps
    if ($lbips -notcontains $awsip){
        $MissingIps.Add("$awsip") | out-null
    }

answered Jul 14, 2017 at 9:00

Ranadip Dutta

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3 Comments

Micky Balladelli Over a year ago

other possibilities are [void]$MissingIps.Add("$awsip") and (but uglier) $null = $MissingIps.Add("$awsip")

Ranadip Dutta Over a year ago

@MickyBalladelli: yup. or we can redirect that to $MissingIps.Add("$awsip") >> $null

joebegborg07 Over a year ago

@RanadipDutta Thanks. Your original solution did the trick :)

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