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A lot of laziness has come from these newer rest/spread syntaxes (something to do with functional programming patterns too?).

As a oldschool Amiga/PCDOS/ASM/C developer who moved on to the web ten years later... it always feels awkward to me to do things like arr = [...arr, ...arr2] because I'm always wondering just how effectively that is handled by the Javascript compiler.

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On a technical side, ubiquity of javascript ensures that performance of common cases will be looked at and improved, if not yet.

But as a fellow former low-level, my humble advice is: stop worrying and write clear code. Clear code eventually will run fast and stay clear. Nuanced code eventually will run as fast but stay nuanced.

Readability and pragmatism always win.

Probably more effectively than anything you could roll yourself.

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