ex-FAANG Developer vs "Hardest" JavaScript Quiz

How well do I know JavaScript? Let's try to find out with this seemingly impossibly hard JS quiz!
JavaScript Is Weird Quiz: jsisweird.com/
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[@SebastianMares]

Yeah, “we” did pretty well. I am proud of “us”.

[@_RG99_]

I carried y'all did nothing fr fr

[@GregHogg]

Answer to Question 8 is wild

[@NoName-1337]

parseInt takes only strings, so it parses the parameter (number) to a string in the first place and then the actual function can parse the string to an int.

[@hundvd_7]

I really don't think it is.
You pass a float to a parseInt function. Of course shenanigans are gonna happen

[@ittixen]

Passing the wrong type of value as an argument may be a mistake but so is inexplicably converting numbers to strings in a different format all of a sudden after an arbitrary threshold.

[@TheRealMangoDev]

8 is ez

[@TheRealMangoDev]

obviusly 5

[@michaldivismusic]

"JS is weird"... What an understatement 😂

[@TheArchCoder]

Are you gonna stop being a react script kitty or what?

[@fireninja8250]

create websites in assembly for less confusing code

[@thekwoka4707]

Some of it isn't even js being weird.

[@TheArchCoder]

@@fireninja8250 fr lmhao

[@rafaeldeleon3386]

More like "WTF JS"

[@swapnil_tech]

23/25 is madd impressive !

[@rafaeldeleon3386]

If I saw someone write any of this code in production, I would request they be fired... immediately.

[@jerichodelacruz6070]

HHahahaah

[@OmarAtri]

I don't think the ECMAScript team would do in this quiz better than you did haha I'm sure you know JS better than they do haha
You're the JS master ✌
JavaScript quizzes are really fun, I'd appreciate more videos like this

[@ConnerArdman]

Haha I’m sure some of them would do better… probably 😂

[@boomba118]

love the "I give up" option in the last question 🤣 even the person who made this quiz knew at that point, most ppl would not be bothered anymore, js is weird 😅

[@jagicyooo2007]

we have a JS expert in the house!

[@VaurionX]

Very impressive. I was shocked at how many you got right.

[@ConnerArdman]

As was I 😂

[@CottidaeSEA]

I knew the answers to the ones you got wrong, but I would've struggled with the type conversion arithmetic.

[@srdjagunjic]

Amazing results!

[@webapplicationsengineer]

I mean, its JavaScript being JavaScript 😂❤

[@NoName-1337]

Great quiz. I did some mistakes and learned a lot. Thank you.

[@Brad_Script]

do not use parseInt and parseFloat with numbers. They take string as argument. Getting weird results with numbers is expected. If you want to convert a float to an integer, use Math.round, Math.trunc, Math.ceil or Math.floor

[@QwDragon]

I got 24/25 - forgot about scientific notation for parseInt. Actually even if i think about it, I don't know how many zeroes needed to get it.

[@InfernalLegion84]

My favorite is that type of NaN is number :D But it makes perfect sense if you think about it

[@strategistaow3520]

Where did you learned that js converters and so

[@ConnerArdman]

I had to read through all the docs when I was making a course a while back. Otherwise I wouldn’t know them haha

[@HippityhoppityGnW]

I took this quiz while looking for the other one you did. I got question 8 without knowing what parseInt even did… needless to say, I did not do well on that quiz. When I saw the explanation, I stared at my monitor for like 1 minute.

[@nomadshiba]

2:42 bro parseint takes a string

[@StandaBlabol]

I am Java developer forced to use JS for some minor stuff.
And my impression is that JS design is based on fentanyl.
But frankly TS is acceptable.

[@amir650]

why is any string that is *not* empty 'considered truthy', but an empty list was shown to also be truthy.

[@velvetsycap6351]

Because an array is an object. The memory address holds an object which is something, which is truthy. An empty string is technically an array aswell but it’s more primitive than an array, so an empty string is more falsely

[@williamseipp9691]

godamn this is wacky. I can't imagine debugging that. I haven't done js yet but am I going to be explicit as hell.

[@cIappo896]

I got 17, somehow. Cool stuff

[@Voidstroyer]

I did the test before watching the video. Got 11/25. I will now commit coding seppuku!!!

[@espertalhao041]

There's a test case that the website is missing: false == [].
There is !![], but that doesn't cover all the weirdness.

[@moveonvillain1080]

This is false right? Empty array is truthy

[@QwDragon]

@@moveonvillain1080 false == [] is true. [] is converted to empty string that is converted to zero. False is zero too. So 0 == 0 which is true.

[@espertalhao041]

@@moveonvillain1080 Try it for yourself, on the console.
Both will be true, which means, an empty array is truthy and falsy, depending on how you test it.

[@amixengineer]

It was very informative thanks Conner 🙌

[@MagnumCarta]

I have no idea how I'd do but I would certainly get less than 23.

[@timchen8512]

Amazing results 😂
Js is really a joke.
😂😂😂

[@lenny4539]

My brain hurts.

[@JawaCodePro]

Hello

[@ryiv1848]

See? Even smart people make mistakes, so don't be too hard on yourself😊💙

[@Endrit719]

I got 0/25

[@ghattassalloum9908]

man that's hard I got 14

[@Macpherson1st1]

JavaScript is weird. Super weird.

[@listener8228]

Bro who invented JavaScript 💀💀

[@user-hy8ju1yn5g]

Fr, it's aids

[@pauloeduardo1461]

Prewatched 😅

[@Presenter2]

I think I'll never will try JS after this video...