JavaScript Number Tricks Every Developer Should Know (2026)


Numbers in JavaScript are weirder than you think. Here are the tricks that save me from bugs.




The Big Gotcha: Floating Point





0.1 + 0.2 === 0.3 // false!
0.1 + 0.2 // 0.30000000000000004






This isn't a JavaScript bug — it's how IEEE 754 floating point...