Spit my coffee out seeing this! Amazing :)

Literally decided to do -1 lines.

Nice.

Dude! It's the first time I've seen using lambda inside a class instead of a function!
You managed to create the smallest and, somehow, easiest answer to analyse of us all!!!

Sir, you got yourself a huge fan in me!

Best practice and Clever! You got it!

I think ListNode... { this.v = value;} will allow external code to mutate the value, therefore violates the constraint of the problem. I might be wrong or there might be a better way... I ended up making a private variable so that no code can set the value after instantiation.

function ListNode(value, next) { this.getValue = function() {return value }; this.n = next; }

Feel free to add it yourself - it's open for contributors. It shouldn't be too hard to port the poly drawing part too - it just spits out some pretty basic svg.

Could you add a (very basic) python version? It would make solutions a bit less cumbersome that javascript…

Thanks!

I think as far as "best practices" are concerned, it's what the code actually does that matters when voting, not the actual style of code employed when writing the solution.

I don't think people are marking submissions as "clever" because someone deleted whitespace/newlines and shortened 3 lines of code into 1, they're voting "clever" because what the code is doing is clever - regardless of syntax, style and other cruft. It just so happens that in a lot of cases, particularly these easier problems, "clever" solutions consist of one line. In addition a lot of people seem to be going for code golf, though there's no benefit of doing that.

In an actual codebase I think that, while most people would spread this snippet of code out, it would nonetheless be considered "best practice".

Not that there's anything wrong with that answer, but I fail to see why it gets upvoted 7 times as best practice compared to others.
I'd rather have this one (http://www.codewars.com/kata/reviews/53952000369894e4f10007ab/groups/539823dfc729da37a4000374) which is more readable (at least in JavaScript where there's a fair amount of syntactic noise. In other more expressive languages (e.g. a ML), even a one-liner would be acceptable and best practice.

Anyways, just pointing out: while this is perfectly correct (and fine for a trivial exercise like this one), I'd rather not people consider it too "best practice" (same for http://www.codewars.com/kata/reviews/53952000369894e4f10007ab/groups/53952f8ca3ba5f5632000f95).