Variable types Memes

Shower temperature control is just like variable types in programming. Regular showers have float temperature with infinite precision between hot and cold. Meanwhile, my shower apparently runs on boolean temperature - either Antarctica or Satan's hot tub, with absolutely nothing in between. Turning the knob half a millimeter is the difference between hypothermia and third-degree burns. It's like my shower was programmed by the same intern who thought binary search was just looking for 1s and 0s.

Finally, a visual representation that my brain can process! Zero is an empty toilet paper roll that still exists and serves as a placeholder. Meanwhile, NULL is when the entire roll is missing—it's not just empty, it's gone , non-existent, undefined. The cardboard tube has left the building. This is exactly what keeps junior devs up at night. Zero is a legitimate value saying "there's nothing here, but I'm counting it." NULL screams "I refuse to acknowledge this variable's existence." And both will break your code in spectacularly different ways when you least expect it.