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copied!<p>Part of the problem is how the array is being used inside the function. Remember, a function in PowerShell doesn't actually <em>return</em> anything. It writes objects to the pipeline. Therefore, the return is superfluous, but not actually causing any problems. The use of the <code>Add</code> function is causing the problem because <code>Add</code> <a href="http://msdn.microsoft.com/en-us/library/system.collections.arraylist.add.aspx" rel="nofollow noreferrer">returns</a> the index at which the value was added and therefore writes to the pipeline as well.</p> <pre><code>function get-myarray { $al = New-Object System.Collections.ArrayList $al.Add( 0 ) $al.Add( 1 ) $al.Add( 'me@co.com' ) $al.Add( 'you.co.com' ) return $al } $array = get-myarray $array.Count 8 </code></pre> <p>Note how the size is 8. What needs to be done is to suppress the writing of what is returned by the <code>Add</code> function. There are a few ways to do this but here is one:</p> <pre><code>function get-myarray { $al = New-Object System.Collections.ArrayList $al.Add( 0 ) | out-null $al.Add( 1 ) | out-null $al.Add( 'me@co.com' ) | out-null $al.Add( 'you.co.com' ) | out-null return $al } $array = get-myarray $array.Count 4 </code></pre> <p>I don't believe the use of `ArrayList' is a wrong one if you want to remove items from it. </p> <p>As far as <em>unrolling</em> goes, this deserves a whole other question and has been <a href="https://stackoverflow.com/a/1829401/4916">already addressed</a>.</p>

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