An array of ways ... to create arrays (JS Basics)

Even in 2024, creating arrays in JavaScript has a few gotchas that you'll want to know about! And don't let sparse arrays catch you off guard!
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[@mk72v2oq]

The real benefit of 'Array.from({ length: 5 }, (i) => { ... })' is that it doesn't allocate an intermediate array to map on. This could lead to significant performance improvement, especially on large arrays.

[@andrew-burgess]

Ooh, good to know!

[@Fullflexno]

Supercool!

[@laesseV]

We lately had exactly that bug where a coworker removed that "unnecessary" spread of Array(x)

[@tarikeljabiri]

Hi man, this video made my tests green, thank you a lot 🙏

[@AfonsoSantos-dx2hq]

Really enjoyed watching, would love more javascript basics videos like this one

[@MichiganTypeScript]

always a good day when a notification for a new Andrew Burgess comes in!

[@krzysztofprzybylski2750]

As much as I like js I feel like sparse arrays were created as a gotcha for developers young and old.

[@alexjohnson-bassworship3150]

Loved it, as usual!!!

[@krccmsitp2884]

JS is insane 😜

[@Nikgek]

really interesting info, thanks

[@maso4u]

do you mind going over you ide, how you have it set up and how do you navigate around it with mostly jyour keyboard

[@TheShoAn]

[1, 2, 3, 4, 5] that's how i create an array

[@deadlyecho]

They should have just gone with a consistent approach where the sparse "empty" cells have an undefined value rather than them being literally empty which affects the stream operators of the array... typical JS 🤦‍♂️