I feel like I have to remind people of this quite often, but the history is such that npm was lightweight at one point, bundling wasn't a thing, and while `isodd`/`iseven` are of course silly, things like `isarray` were not functions that existed back then (we didn't have Array.isArray). `typeof [] === 'object'` in JS, so e.g. my package `is-arrayish` checked for a similar structure to an array (whereas Id guess `isarray` checked for the prototype). `isarray` failed for the `arguments` keyword, which was needed for variadics before argument spreads were added to the language I believe in ES5.

So of course they don't make sense now. But they were created for a reason. Before even Markov chains were a fad - let alone LLMs - we were trying to be as efficient as possible and maximize code reuse I stead of writing the same helper functions over and over again. That's what you're seeing.

There’s a bit more nuance as to why. It’s not fair to say that the average JS dev is reaching for a package like is-odd/is-even.

Years ago when npm was just getting started there was a lot of experimentation and land grabbing for packages. A few “prolific” developers were pushing these tiny utilities and then using them in their own projects which ended up being required as deps in other projects and then snowballed into is-odd being included in webpack at some point (I think I have that timeline roughly correct).

It’s still a crappy problem for sure but it’s not fair to paint most JS devs with a brush so broad.