Wow, guess I learned something new today! :D

Damn, this has to be best practice - a one-liner, readable and efficient to boot! Learned something new today.

Because if any of us are actually led to believe this is "Best Practice" and decide to use this code in a production environment or for an interview with Google, it would be bad.

One-liners that are absolutely not best practice but are great fun, let's go! :D

That's the thing, they aren't. It's a culture thing :D

People just upvote one-liners as best practice for the sole purpose that it compacts more code into a smaller space and is thus seen as minimalist or cool.

Of course, sometimes (such as for list comprehensions or for cases where it's easier to use a built-in function) one-liners are actually best practice, but half the time, it's more likely to be someone using some esoteric, relatively niche and/or inefficient code in a one-liner.

But it's been 11 months so you probably know by now.