The Daily WTF: Curious Perversions in Information Technology

Required Fields

by Remy Porter in CodeSOD on 2026-06-16

If you want to connect to another system, you need to supply credentials. That's a pretty obvious requirement. We can set aside the whole technical challenge of managing those credentials and the security problems various techniques create, and just focus in on: you must supply some credentials to authenticate.

Lisa has inherited a method which connects to another system. It, correctly, will complain if you don't supply parameters for credentials. It will, incorrectly, mislead you about their requirement:

12 comments - Last comment @ 14:27

Caught a Mistake

by Remy Porter in CodeSOD on 2026-06-15

Daniel recently started a new job. His first task was to fetch some data from the database and render it to the user. Easy enough, and there were already wrapper functions around the database to make it easy. He called execute_read, passed it a query, and checked the results.

There were no results. But the query definitely should have returned results. What was going on?

12 comments - Last comment @ 12:50

Dating in Hungarian

by Remy Porter in CodeSOD on 2026-06-11

A horse can only be so tenderized, but as well established at this point: I don't like Hungarian Notation. Richard G sends us an example of yet more of it, being misused, as well as some bad date handling. That's basically two of the easiest things to complain about, so let's take a look!

DateTime sCDate2 = Convert.ToDateTime(Hdn_SelectedDate.Value);
Double dStart2 = double.Parse(Hdn_SelectedShifts.Value.Split('@')[0]); // Gets something like "10.5" for 10:30

// More code ...

DateTime lSelectedStartAdd = DateTime.Parse(sCDate2.ToShortDateString() + " " + DateTime.FromOADate((dStart2) / 24).ToShortTimeString());

25 comments - Last comment @ 06:05

Delicious Fudge

by Remy Porter in CodeSOD on 2026-06-10

Stella (previously) sends us a much elided snippet. The original code is several thousand lines contained in a single try block. But the WTF is pretty clear without seeing all of that:

try:
  # the whole business logic without any exception handling
except:
  print("Fudge")

11 comments - Last comment @ 2026-06-11

Driven Development

by Remy Porter in CodeSOD on 2026-06-09

We should always be wary of "(.+)-driven development". Things like test-driven development, or domain-driven development are fine, but they're also frequently approached from a perspective of dogma, which creates its own terrible outcomes.

But let's talk about domain-driven development. Without getting too bogged down into the details of the approach, the idea is pretty straightforward: describe you domain model without reference to any lower-level concerns, so you can effectively write your domain logic in an abstract language tuned to your specific needs. In other words, it's just a pretty good practice. DDD offers tools and techniques for doing it, and as stated, can be adopted as a point of dogma instead of technique.

11 comments - Last comment @ 2026-06-12

Check and Check

by Remy Porter in CodeSOD on 2026-06-08

Today's anonymous submitter sends us a React view that presents some admin options. Of course, it should only show us those admin options if the user is authorized to do that. So let's see how they implemented it:

{(isAdmin || canSeeResults) && (
    <div>
        <p>Admin Actions</p>
            {(isAdmin || canSeeResults) && (
                <div>
                    <button> Show Results </button>
                </div>
            )}
    </div>
)}

11 comments - Last comment @ 2026-06-09

Build Up

by Remy Porter in CodeSOD on 2026-06-04

If there's one thing that seems to be a constant source of issues, it's people constructing SQL queries through string concatenation. Even if you're using parameters in the query, I'm opposed to handling raw SQL as strings in my programs. My solution is always "use a builder"- an API that constructs a syntax tree that it can then render to SQL as needed. (Yes, a builder, not an ORM, that's a whole other discussion, I'm not dogmatically anti-ORM, but it's a leaky abstraction at best.)

Many languages have such a thing, Java included. Lukasz's team was using Java, and they had a rule: "don't do SQL strings, use a builder". Unfortunately for Lukasz's team, their guideline didn't specify what kind of builder.

17 comments - Last comment @ 03:55

Coerce the Truth Out of You

by Remy Porter in CodeSOD on 2026-06-03

Frank suspected something odd when he spotted a use of React's useMemo function in some JavaScript code. Now, there's nothing wrong with using that method, in and of itself. It watches some variables and recalculates a callback if they change for any reason. It's a great tool for when you want to avoid recalculating expensive things over and over again.

But in this case, the calculation in question was isAuthorized, which wasn't an expensive calculation; it was just checking if certain values are set. The code looked like this:

9 comments - Last comment @ 2026-06-08

Blocked the Date

by Remy Porter in CodeSOD on 2026-06-02

Volodya sends us some bad date handling code in PHP. Which, I know, you're just reaching for the close tab and yawning when you hear that. You've seen it before. But bear with me, this one still has some fun bits to it.

$monthes = array(
        1 => 'Января', 2 => 'Февраля', 3 => 'Марта', 4 => 'Апреля',
        5 => 'Мая', 6 => 'Июня', 7 => 'Июля', 8 => 'Августа',
        9 => 'Сентября', 10 => 'Октября', 11 => 'Ноября', 12 => 'Декабря'
);

17 comments - Last comment @ 2026-06-03

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