- You can call it “Java” to enrage other programmers
- You can compare numbers against strings without wasting time converting them
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If you’re living in 2002 and not using the strict equality operator, that’s on you
But what if I don’t want strict comparison? What if my frontend contains a text field for a numeric input and I wanna manually check against each possible valid input value
if (input_val == 1) {...} else if (input_val == 2) {...} else if...without having to convert it first or check that it’s actually a number or fix my frontend?(I’m sure there are valid use cases for non-strict comparison, I just can’t think of one right now)
why wouldn’t you just convert inline?
(Number(input_val) === 2)Converting would mean you could use a switch statement with your example rather than an if else ladder
switch(Number(input_val)) { case 1: doTheFirstThing(); break; case 2: doTheSecondThing(); break; case 3: doTheThirdThing(); break; }If you’re looking for good code, you missed the point of my comment 😄
If I was looking for an enumeration of valid inputs, I’d make it a selection box rather than a text field that’s supposed to contain a number and give the selections reasonable names. If I want an integral quantity, I’d use a number input field.
If I have no control over the frontend, that means I’m writing a backend in JS for a bullshit frontend, and no amount of good coding practice is going to salvage this mess.
I’m also blessedly far away from WebDev now. I work in Data Analytics and if I ever have to do any of this for a living, something has gone very wrong.
Converting texts into numbers or dates still haunts me though - fuck text inputs for numbers and dates.
Array(16).join(“wat” - 1) + " Batman!";
JavaScript: :wide eyed and smiling: Sure why not! You’re the boss!
Python: Sighing and downing half a bottle of Advil: Sure. Why not, you’re the boss.
The scripting language formerly known as Java.
- Is available to be used in website scripting.
- Not quite as full of footguns as PHP (although it is close).
PHP is actually quite footgun free these days.
awaitandasyncYou can make your speakers go BRRRRRRRRR via Home Assistant with it
Elaborate?
A lot of people are familiar with it and…um…hackers like it being in use?
- It runs in the browser
- Web developers know it already so we might as well
deploy targets, typescript
- Ubiquity
- Easy adoption for those familiar with C family of languages
- it’s easy to make fun of
- it makes every other programming language look better in comparison
You’ll find an npm package to help you count up to 2.
(I recently learned - maybe here - that the is-even package has over 170k weekly downloads)
This must be a “hold my beer” kind of joke and someone wanting to see how far they can take it.
What’s even wilder is if you look at the code of that package, all it does is include the is-odd package and then return !is-odd. And the is-odd package isn’t much better, it does some basic checks on the input and then returns n % 2 === 1.
I’ve always looked at stuff like that as much more along the lines of performance art than anything else.
I thought I was missing something. JS is one of my main languages and I always just write the is-odd function myself since it’s like 10 characters. It boggles the mind that is-even has 176k weekly downloads
Also there are 40-something packages depending on it, so I guess it gets pulled automatically when they are used.
If youre lazy/busy enough, doing basic checks on the input is enough boilerplate to package out.
To be fair having a name can make things easier to read. I get that
i % 2 == 0is a common pattern and most programmers will quickly recognize what is happening. ButisEven(i)is just that much easier to grok and leaves that brainpower to work on something else.But I would never import a package for it. I would just create a local helper for something this trivial.
Exactly what I would do if I had to reuse it, especially now since I know that adding a package would actually add 2. It all just seems so…inefficient
Even if the code isn’t reused adding names to sub-expressions can be very valuable. Often times I introduce new functions or variables even if they are only used once so that I can give them a descriptive name which helps the reader more quickly understand what is happening.
Yeah, I do that with pretty much every separate operation in c# since our solutions are pretty big. Most of my JS scripts are just done in ServiceNow which are separated and named appropriately.
Is-even continues to be the best joke in the industry
Oh boy, this actually made me laugh out loud
- Ubiquitous; insane amount of libraries and probably some of the best documentation of any language
- JS lambda function syntax is nice
It leads to typescript
You get surprises from npm
You get suprises from npm
I spent way too long today figuring out why my app was doing something that it’s NOT supposed to do on weekends.
I read Luxon’s docs (pretty cool lib tbh) again and again, and tried everything I could think of to get isWeekend to return a sane result.
Turns out I was pulling a somewhat older version of Luxon, where isWeekend didn’t exist. In any sane language, I expect I’d get a huge warning about a property that doesn’t exist, but alas…
Typescript helps me keep my sanity, but juuuuust barely.
That’s fair. Typescript has to cook with the existing js ecosystem.
Weren’t you getting runtime errors for the function not being found?
I don’t know how luxon works, but isWeekend could be a property instead of a function
It is. It also happens to be undefined, and checking that for truth is how I was bitten.
No, they were probably getting false every time
Falsy* because it was undefined
However, their IDE should have highlighted it as an unknown property. Guess this guy is coding in notepad or vi.
Yep, thanks for correcting me. In fact, if they write something like
if (day.isWeekend) {...}The block will never be executed with the old version of library
Yeah that’s exactly what I think happened to him. He needs a better IDE and/or needs to stop copy/pasting code from stackoverflow or documentation that doesn’t match his library version.
My dude, you need to understand that all that anger and resentment, it is not you. It’s the years of JavaScript poisoning your mind.
In any case, that goes to my point. I would have to be saved by my IDE, when any sane language will blow up in your face as soon as you try to run it.
If isWeekend doesn’t exist, then the weekend doesn’t exist, so it’s naturally false.
That’s why JavaScript gets pushed so hard - it’s part of the capitalist agenda to keep us working 7 days a week
1 - Easiest way to run a script in your browser
2 - Always finds its way if inputs are bad
Nan - undefinedNaN is of type number. because fuck me.
IEEE-754
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Falsy zero? What’s wrong with that, 1 is true and 0 is false. I thought that was standard logic?
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ah ok , I think I write this a bit more verbose when using other languages, instead of
if(thing) { stuff; }I do
if(thing != null) { stuff; }so checking for numbers being truthy & existing didn’t seem like an issue
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To be fair, this is actually reasonable. But it does look stupid on the face of it.
Easiest? More like… The only way.
You can make minecraft mods
that’s java
Everyone know JavaSript is a Java, but you don’t have to compile, so you script in it.
/s
There’ll be a modloader in the next 5 years that will have you load .js scripts as mods
- It runs in browsers
- If you hate your co-workers, then they will also feel your pain.
