Random objects in returned array

README.md

Call as .\BuildTags.ps1 --input a --output b

If you set a breakpoint at line 36 and inspect $pathPairs, it looks normal. If you inspect the return value at line 39 or 40, however, it contains extra numbers, like this:

0
0
0
1
0
a
b

BuildTags.ps1

$ErrorActionPreference = "Stop"

function ParseArgs($inputArguments) {
    $processingInput = $false
    $processingOutput = $false
    $inputPaths = [System.Collections.ArrayList]@()
    $outputPaths = [System.Collections.ArrayList]@()

    $inputArguments | ForEach-Object {
        if ($_ -ieq "--inputs") {
            $processingOutput = $false
            $processingInput = $true
        } elseif ($_ -ieq "--outputs") {
            $processingOutput = $true
            $processingInput = $false
        } elseif ($processingInput -eq $true) {
            $inputPaths.Add($_)
        } elseif ($processingOutput -eq $true) {
            $outputPaths.Add($_)
        }
    }

    if (-not ($inputPaths.Count -eq $outputPaths.Count)) {
        throw "Input and output path numbers mismatch"
        exit 1
    }

    $pathPairs = [System.Collections.ArrayList]@()
    for ($i = 0; $i -lt $inputPaths.Count; $i++) {
        $entry = [System.Collections.ArrayList]@()
        $entry.Add($inputPaths[$i])
        $entry.Add($outputPaths[$i])
        $pathPairs.Add($entry)
    }
    
    return $pathPairs
}

$abc = @(ParseArgs $args)
$pathPairs = ParseArgs $args
$gitHash = & git rev-parse HEAD
$gitBranch = & git rev-parse --abbrev-ref HEAD

$pathPairs | ForEach-Object {
    Write-Host "Generating '$($_[1])'"
    $inputFile = Get-Content -Path $_[0]
    $outputFile = $inputFile.Replace("GitCommitHash = `"`"", "GitCommitHash = `"$($gitHash)`"").Replace("GitBranch = `"`"", "GitBranch = `"$($gitBranch)`"")
    $outputFile | Set-Content -Path $_[1]
}