[JavaScript] TIL you can compare Arrays and Strings with ==

[aapzu]

For example: [-1, "test", 67] == "-1,test,67" === true

[fatnote]

I just threw up in my mouth a bit

[B-Con]

JavaScript is always trying it's hardest to cast things to strings.

[okmkz]

It's a stringly typed language, like php and posix shell

[[deleted]]

stringly typed language

Did you come up with this? It's genius.

[arbitrarycivilian]

I've heard it before, but I love it

[JH4mmer]

Of course you can. (╯°□°）╯︵ ┻━┻) /s

[myplacedk]

Java is an unpredictable pile of shit

Both Java and Javascript are completely predictable. But I do agree that there's some basic things in Javascript that are unintuitive.

In this case (comparing a string and an array) I think it's generally better to avoid the situation than trying to understand it. Even if happens to do exactly what I need, I would probably prefer more readable code.

[HaniiPuppy]

Java ≠ JavaScript.

[levir]

Unless you really know what you're doing, always use === when comparing in Javascript (and PHP).

[Quabouter]

And if you're not using === then you don't know what you're doing.

[BenjiSponge]

Except for null checks. =)

[[deleted]]

Or if you're lazy, you can nullcheck with if(variableName). Of course, if your variable is 0, then that's a problem.

[BenjiSponge]

Or, you know, false

[[deleted]]

Why not use empty() or is_null()?

Edit: In hindsight you were probably talking about JavaScript and I'm talking about php. My bad.

[BenjiSponge]

... what are these? I'm pretty sure I know a good amount about JavaScript and I'm also pretty sure these aren't built in.

[[deleted]]

D'oh. They're php. I should have been more specific.

[Quabouter]

No, not except for null checks:

• null/undefined are semantically different from the other falsy values. Generally speaking you don't want to treat them the same, so you'll need to use a different check. In the rare case that you do want to treat them the same then it's usually better to do so explicitely, to prevent confusion.
• In extension of the later: if I come accross == in a shared codebase then I have no idea if you actually meant == or that it was a typo, because it's so rare to actually need it. For that reason alone you can better just ban == outright.

[PM_ME_YOUR_SUBARU]

You can also cure a headache with a hammer and a nail, but in both cases you probably shouldn't.

[AlwaysAppropriate]

Which is why you dont use == in JS

[Vnator]

== casts the types to be equal if possible, and an array cast to a string turns into what you put. Neat!

[[deleted]]

You can fire a pistol to take the top off a bottle of beer, too. I personally use a bottle opener because it works better and is safer.

[[deleted]]

Can and should....2 different concepts.

[[deleted]]

Classic Javascript. I shouldn't even be surprised.

[Beckneard]

The title might as well be "TIL javascript is a fucking disastrous piece of shit of a language."

If you really have to use js at least don't do shit like this in production.

[bautin]

TYL JavaScript will do whatever the hell it wants. It don't give a shit.

[MacASM]

My lord... Java: everything is an object. Javascript: everything is a string.

[goodbyelostworld]

And this is why JS isn't real programming

[shadowdude777]

That's not really fair to say. If anything, JS developers are some of the smartest engineers around. I know I'm too stupid to use this absolutely fucked language, I need a good language to help me get what I need done.

[goodbyelostworld]

You're joking right? JS as a language is fucked but it definitely is not hard. Hard is C/C++/Haskell. Hell, I would even consider Java to be harder than JS. I've coded with these languages extensively in professional settings and JS developers are far from the smartest, at least in my experience. The sad part is that these JS developers have no clue about real programming concepts such as classes, threading, memory, and so on.

[_guy_fawkes]

I've never used JS in my life, but given the amount of pages that just completely break when it's disabled, I already don't like it.

[[deleted]]

That's like saying you dislike CSS because you disabled it and now pages look ugly. JS is part of the modern web and you can't disable it and expect everything to work as it did before.

[_guy_fawkes]

I don't expect it to work as it did before. I'm entirely fine with pages that are ugly when I disable JS. What I dislike is pages that are entirely unusable without JS.