this post was submitted on 17 May 2025
503 points (97.9% liked)

Programmer Humor

23585 readers
887 users here now

Welcome to Programmer Humor!

This is a place where you can post jokes, memes, humor, etc. related to programming!

For sharing awful code theres also Programming Horror.

Rules

founded 2 years ago
MODERATORS
anzo@programming.dev
Feyter@programming.dev
BurningTurtle@programming.dev
pylapp@programming.dev
503
Which of these javascript expressions is false? (europe.pub)
submitted 2 weeks ago by cm0002@lemmy.world to c/programmer_humor@programming.dev
83 comments fedilink hide all child comments
you are viewing a single comment's thread
view the rest of the comments
[–] smlckz@programming.dev 2 points 3 days ago* (last edited 3 days ago)

Another way to check whether a number is NaN:

const isNaN = res !== res;

As NaN is the only value out there that is not equal to itself. See my other comment on this post for more: https://programming.dev/comment/17221245

This comparison should work in every programming language out there that implements/respects/uses IEEE 754 floating point numbers.