Not sure why many people think this is good practice and clever... this will evaluate ALL the string options, consuming unecessary CPU cicles for results that won't be used. It will work, though might not be the most performant solution.

nice

Nicely done. I love this. Readable and straight foward without overhead.

Very elegant! Thank you

maybe I'm wrong but that solution is not correct.
look what happens with this test case - longest(['f', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'k', 'l'], 2)
the result should be - 'b' but it is 'f'

maybe there is something to resolve

http://screencloud.net/v/y47
http://screencloud.net/v/qdPO

Very nicelly done, I just wanted to improve on your allready grate code.

I think i'm getting it but to be clear, the valueOf in this challenge makes sure that the x returned is a number? I am trying to figure out why the code doesn't work with that line.

I totally agree but it is not the author who says the "kyu". Thanks for your feedback!

very good kata but I feel like it should be in difficulty more than 5

Great kata!