Debugging Challenge #6

Previously on Dr. Lambda's blog:

I have deviced a series of debugging challenges, some are easy, some are really hard, all come from real live systems. Good luck!

The Challenge

• 1 point if you can spot where the error is.
• +1 point if you can explain why.
• +2 points if you can explain how to fix it.

@Echo off

set direct=1
echo %cmdcmdline% | find /i "%~n0" >nul
if not %errorlevel% == 1 set direct=0

REM powershell.exe -file .\AdHocScripts\FlushBlobCache.ps1
Set e=%errorlevel%
if not %e% == 0 goto error

powershell.exe -Version 2 -file .\AdHocScripts\FarmIISReset.ps1
Set e=%errorlevel%
if not %e% == 0 goto error

goto success

:error
    Echo ERROR, errorlevel %e%
    if %direct% == 0 pause else exit %e%
    goto end
:success
    Echo done
    if %direct% == 0 pause
:end

Debugging Challenge #5

Previously on Dr. Lambda's blog:

I have deviced a series of debugging challenges, some are easy, some are really hard, all come from real live systems. Good luck!

The Challenge

• 1 point if you can spot where the error is.
• +1 point if you can explain why.
• +2 points if you can explain how to fix it.

// @param date  string in the format YYYY-MM-DD
function isBeforeToday(date: string) {
  return new Date(date).getTime() 
      < Math.floor(Date.now() / 86400000) * 86400000;
}

Debugging Challenge #4

Previously on Dr. Lambda's blog:

I have deviced a series of debugging challenges, some are easy, some are really hard, all come from real live systems. Good luck!

The Challenge

• 1 point if you can spot where the error is.
• +1 point if you can explain why.
• +2 points if you can explain how to fix it.

let csv_split seperator str =
  let csvSplit = new Regex(
    "((?:\")[^\"]*(?:\"(?=,|$)+)|(?<=,|^)[^,\"]*(?=,|$))", 
    RegexOptions.Compiled) in
  csvSplit.Matches(str)
    .OfType<Match>()
    .Select(fun m -> m.Value.TrimStart(','))
    .ToArray()

Debugging Challenge #3

Previously on Dr. Lambda's blog:

I have deviced a series of debugging challenges, some are easy, some are really hard, all come from real live systems. Good luck!

The Challenge

• 1 point if you can spot where the error is.
• +1 point if you can explain why.
• +2 points if you can explain how to fix it.

int index = addressLine.Length;
for (int i = 0; i < 10; i++)
{
    int position = addressLine.IndexOf(i.ToString());
    if (position != -1 && position < index)
        index = position;
}
string street = addressLine.Substring(0, index).Trim();
string nr = addressLine
            .Substring(index, addressLine.Length - index)
            .Trim();