JavaScript Arrays Probably Don't Work How You Expect

JavaScript arrays are a bit trickier than you might think. We can manipulate the length of the array in all kinds of different ways!

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[leonss]

They're not arrays, as arrays are fixed length.
But they're not ArrayLists either, they're pretty much hashmaps in disguise, so they're not guaranteed to be contiguous memory.
Even if they were contiguous memory, they don't hold the values, but references to the values which are sparse throughout memory, so there's a performance hit due to cache misses either way.

[big_bits]

I always liked how free and flexible javascript was to be honest

[camerobaird]

the first code language i learned was js, so this just feels normal to me

[YourSuizo]

These are totally logical, but I wouldn't use it in production code. Especially the first one (in niche cases it might be okay, but there are other ways). The second one can be done easily with slice or destructuring.

[Urbanghxst]

Why would we use this? What’s the point of this

[mihirsawant]

It's kind of bit confusing as arrays are fixed length, so it should be to first set length and then work, it works like List only, I think, I mean not really following array properties.

[jefferymuter]

When this makes sense, have I finally transcended? Or have i simply embraced madness?

[AAA]

js is a chill guy like that,
you just don’t get it !!

[Tully]

From everything i read, im glad I'm starting with Javascript. That way, when i move to something else, anything else, it will be like understanding a childrens book.

[Casprizzle]

Well you see if you simply do things no one would ever do, you can get some wacky results! JS is so weird!🙄

[EricEGunes]

🫨😱🤯 I know nothing about JS , why do I feel like a junior every time when I watch your videos 😶‍🌫️😶‍🌫️😭

[francescos]

for me that’s entirely logical, I don’t like how other languages restrict interaction with arrays. I know, I am also funny irl