How do I dynamically add elements to arrays in PowerShell?

Question

I don\'t have much PowerShell experience yet and am trying to teach myself as I go along.

I\'m trying to make some proof of concept code for a bigger project. The main g

Answer 1

Instead of re-creating the array in each loop iteration (which is basically what's happening each time you add to it), assign the result of the the loop to a variable:

$testArray = foreach($item in $tempArray)
{
    addToArray $item
}

Answer 2

$testArray = [System.Collections.ArrayList]@()
$tempArray = "123", "321", "453"

foreach($item in $tempArray)
{
    $arrayID = $testArray.Add($item)
}

Answer 3

The problem is one of scope; inside your addToArray function change the line to this:

$script:testArray += $Item1

...to store into the array variable you are expecting.

Answer 4

If you are going to play with a dynamic amount of items, a more precise solution might be using the List:

$testArray = New-Object System.Collections.Generic.List[System.Object]

$tempArray = "123", "321", "453"

foreach($item in $tempArray)
{
    $testArray.Add($item)
}

Note: In this case you get the power of the List from .Net, so you can easily apply linq, merge, split, and do anything which you'd do with the List in .Net