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Yap, sorry, I've corrected that. Problems of a non-native english speaker...

Well, it might be slower. But I think that for the purpose of his application it's good enough.
You can always spend more time trying to optimize things, but I think that in this case it is way clearer than to work with lots of indexes, increments or whatever (which was my case).

The simple use of high level functions with his simple algorithm in mind is enough until more performance is actually needed.

Not saying that measuring and comparing performance is not valid at all though.

correct, thanks

forkmonkey: his solution is short, I give him that. But it is in no way fast, especially since he has to reverse() twice in one pass. Please refer to http://jsperf.com/codewars-snail to see actual data on medium sized arrays. Differences will increase drastically if larger arrays are used.

haan, explain your meaning, please.

It might be beautiful, but an algorithmic nightmare :)

Thanks to you both! Of all my kata solutions, this is my favorite.

OMG, yes it is.