I have the following PowerShell function that works well for any input except for 1. If I pass it an input of 1 it will return an array with two elements 1,1 instead of a single element which is itself an array of two elements (1,1).

Any ideas how I can make PowerShell return a jagged array with one element that is itself an array?

function getFactorPairs {
    param($n)
    $factorPairs = @()
    $maxDiv = [math]::sqrt($n)
    write-verbose "Max Divisor: $maxDiv"
    for($c = 1; $c -le $maxDiv; $c ++) {
        $o = $n / $c;
        if($o -eq [math]::floor($o)) {
            write-debug "Factor Pair: $c, $o"
            $factorPairs += ,@($c,$o) # comma tells powershell to add defined array as element in existing array instead of adding array elements to existing array
        }
    }
    return $factorPairs
}

Here is my test and it's output showing the problem. You can see that the first example (1 as input) is returning a length of 2 even though there was only one factor pair found. The second example (6 as input) is working properly and is returning a length of 2 with two factor pairs found.

~» (getFactorPairs 1).length  
   DEBUG: Factor Pair: 1, 1  
   2  

~» (getFactorPairs 6).length  
   DEBUG: Factor Pair: 1, 6  
   DEBUG: Factor Pair: 2, 3  
   2
arrays powershell
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