JavaScript gotchas
JS has some weird behaviours—some are intentional and/or 🤔 has underlying explanation, some are old f-up's that could not be removed in new versions lest they broke existing apps, some are due to JavaScript's "forgiving" nature outside strict mode.
These notes focus on things that are not obvious at first, but might trip you up if you are not explicitly aware of them. And when they do, you'll go "HUH WTF, who would have known??".
- Numbers cannot be too big, too small, or a decimal
- Typeof NaN is number
- Typeof null is object
- Modifying object property mutates other objects
More JS oddities: wtfjs.com
In: JavaScript MOC