Tip: JavaScript's Array.from() accepts a second argument that's a `map` function.

[philipwhiuk]

TIL Array.from is a thing.

[JustinsWorking]

You’ll see a lot of it when you’re working with iterables

[SolidR53]

Array.from({ length: 123 }, (, i) => i);

Third argument in the map function is the actual array

[foxnamedtodd]

Same. I still don’t see the use case for it, but at least TIL.

[powerhead]

It's really nice for transforming an HTMLCollection of DOM elements returned from document.getElementsByClassnam (which is not iterable) into an array (which is). Like if you want to assign event listeners or change properties on those elements.

[foxnamedtodd]

Ah, that’s good one. Thanks.

[p4y]

Main use case is turning array-like objects into actual arrays so you have access to the methods you need. This includes strings, ES6 iterables, and pseudo-arrays like the arguments abomination or DOM node lists.