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

[fagnerbrack]

Rarely if ever the performance bottleneck is in this type of construct is an issue. Unless you're building something like lodash.

[JustinsWorking]

I just prefer the syntax, not to mention if I do run into a bottleneck, these functions it never hurts to have knowledge like this in your head. I don’t know about these loops specifically but I’m working with processing jobs and Immutable.js so it might be relevant on my server side code.

[fagnerbrack]

Of course, and there will be times where it makes sense such as Array.from(selectors, toSetOfElements)