nice kata, go back to school :) http://en.wikipedia.org/wiki/Pythagorean_theorem

I think Your function must be more precise... ",0.29164992761798203" !== "0.29164992761798203"

this kata need random tests for eliminate lazy solutions laike ssineriz.

I like it.

Agree...

Heh, Your description is much better... I've updated desc, and tests...

why don't you copy paste solution?

I've updated description. Thanks.

This was significantly a trap for me...

Test are to lazy. For example many solutions (included mine) don't pass test like this:
Test.expect([1,'[',']'].sameStructureAs([2,2,2]), "[1,'[',']'] same as [2,2,2]");

I like it.

Nice Kata!

thanks, I fixed an error in description

thanks for reply... you're right. Try now... test are more accurate...

It's my fault... sorry for confusion... I've updated tests and now expect that 'add' return string not float.

But in your solution this is not the only problem.
For example 10000.18+10000.118 in your solution got 20000.298000000003.