is-number

The post is complaining about a library for a problem that javascript had 12 years ago, was not a thing for 7 years, and the ecosystem moved on. Typescript was not a thing back then. (or more exactly, it was a small thing out of the all too many transpile-to-js languages, at least) Yes, having a library named is-number looks very stupid until you look at the state of javascript in 2014. Look at issue is-number#1[0] if you’re interested. The library is-arrayish exists because array-like objects are actually a thing in javascript. About is-regexp: the author mentions that their library supports cross-realm values because it’s useful, but then says that it’s an edge case that most libraries don’t need to care about? The whole reason that the library exists is to cover the edge cases. If not needed, yes the consumers of the library would have

I don’t think the root logic it ultimately depends on is obvious: https://github.com/jonschlinkert/is-number/blob/master/index... And so this is a perfect abstraction to make something non- obvious obvious. The real question is why this shouldn’t be part of the interpreter? Yes the dependency on isOdd is needless, but is a red herring. Most commenters here didn’t look deep enough, sadly.

Looks like the author of these packages agrees. While the is-even and is-odd packages are under the i-voted-for-trump user with the description "This is a joke", the is-number package [1] is still kept under the main profile of the author, the repository is still active on GitHub and there are active issues. [1] https://github.com/jonschlinkert/is-number

> not what the code in this package does Here's `is-number` (https://github.com/jonschlinkert/is-number/blob/master/index...): module.exports = function(num) { if (typeof num === 'number') { return num - num === 0; } if (typeof num === 'string' && num.trim() !== '') { return Number.isFinite ? Number.isFinite(+num) : isFinite(+num); } return false; }; Care to explain why these 5 lines of code need to be a package? To me, having something so simple be a package by itself is absurd.

And the corresponding source code [0] if (typeof num === 'number') { return num - num === 0; } if (typeof num === 'string' && num.trim() !== '') { return Number.isFinite ? Number.isFinite(+num) : isFinite(+num); } return false; [0]: https://github.com/jonschlinkert/is-number/blob/master/index...