“Is that an ‘l’ or a ‘1’? Wait… is that an ‘O’ or a zero?”

It’s in these moments that you realize programming isn’t always about solving problems—sometimes it’s about solving the mystery of your own making.

Here’s the thing: we’re lazy. Not in a bad way, just in a “let me type this as fast as my brain can think it” kind of way.

We use i for loops. x for whatever. o for… something. And then the universe decides to play a cruel joke. In most code editors, these characters look like long-lost twins:

  • l (lowercase L) and 1 (one)
  • O (uppercase O) and 0 (zero)
  • I (uppercase I) and l (lowercase L)

So when you write:

if (O == 0) {
  l += 1;
}

You’re basically writing a riddle for your future self. And trust me, future you will not appreciate it.

Someone’s probably told you: “Download Fira Code! Try JetBrains Mono! Problem solved!”

And sure, those fonts help. They add little flourishes so 0 has a dot and 1 has a little hat. It’s like putting glasses on your code—definitely better, but it doesn’t fix the real problem.

Because if you’re using a single letter that could be mistaken for something else, you’re still gambling. A font won’t save you if you named your variable OO and your function 00.

Take a look:

What i did wrong

let l = 5;
let O = "open";

How i fixed it

let lowerCaseL = 5;  // okay, still weird, but at least you know
let uppercaseO = "open";

&

let maxAttempts = 5;
let doorStatus = "open";
let currentIndex = 0;

See what happened there? Suddenly you don’t need to decode anything. The code tells you what it does. It’s like the difference between a cryptic text message and a clear sentence.

This isn’t about being “clean code” snob. This is about survival. When your code reads clearly, you:

  • Find bugs faster
  • Fix things quicker
  • Collaborate easier
  • Feel less stressed

I’ve been the person who opens a file from three months ago and thinks, “Who wrote this mess?” but here’s what I’ve learned after years of writing code and occasionally crying over it:

If someone can read your variable name and instantly know what it represents, you’ve won!.

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