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I just created my first NPM package. It ain't much but it's honest work

Ivan Spoljaric on July 24, 2020

Yesterday I learned that these NPM packages exist: https://www.npmjs.com/package/is-odd https://www.npmjs.com/package/is-even https://www.npmjs....

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Aradhya Alamuru • Jul 25 '20

Haha I had a very similar post planned - you beat me to it!

The is-even package has a dependency - is-odd lolol

var isOdd = require('is-odd');
module.exports = function isEven(i) {
  return !isOdd(i);
};

Ivan Spoljaric • Jul 26 '20

Yeah, but that is some genius level stuff :)

Aradhya Alamuru • Jul 26 '20

Lol the only thing left is to get it into the react core or something

Lucas G. Terracino • Jul 24 '20

I was surprised with the is-odd and is-even download amount. But you know, sometimes you just need to know wether it is or not.

Konrad Linkowski • Jul 24 '20

Those useless packages have so many downloads, because some basic,useful package use it. And for example webpack use this useful package. So now everyone installing webpack or something that uses webpack (basically any top is framework) is counted as download.

intrnl • Jul 25 '20

would be more appropriate to say that webpack doesn't actually use is-odd and is-even, one of the dependencies uses it.

Richard Tong • Jul 24 '20

I think the idea of your package is actually pretty useful. Just found something similar that has ~2k weekly downloads.

npmjs.com/package/range

My guess is it's just preference for is-odd and is-even.

Orkhan Farmanli • Jul 26 '20

JS community fascinates me every passing day

Harry Balls • Jul 25 '20

Well, that's odd!

Michael Fasani • Jul 25 '20

Keeps the playing field even!

Colum Ferry • Jul 26 '20

Gotta check the numbers on that one

touibeg mohamed • Jul 24 '20

thank you for your short work ...

Ivan Spoljaric • Jul 26 '20

No problem. Thank you for taking the time to read my post.

milan997 • Jul 26 '20

Why is line "num - num === 0" needed?

Ivan Spoljaric • Jul 26 '20 • Edited

Ambar explained it pretty well.

I think the best, and easiest way, to check if a variable is of type 'number' in JS, is to use the

Number.isFinite(num)

method.

It will weed out anything that is not a number, including NaN and Infinity.

Ambar Mutha • Jul 26 '20 • Edited

If simply true is returned, input NaN (not a number) will also return true. It turns out typeof NaN is number. Also NaN - NaN is NaN so this expression num - num === 0 returns true only when num is a number except NaN.

Ivan Spoljaric • Jul 26 '20 • Edited

Yeah. And same goes for Infinity and -Infinity.