ruby version has function names inssue.

Test function name : numObj
Submit function name : num_obj

ruby versions function name is wrong

shiftian, not lifttian.

very puzzled at casting, somewhat

think about all cases: 2 odds, 2 even and 1 odd& 1even, you will find all cases lead to same result: even number.

42 + 92

shifted_diff or shiftedDiff??

This is a nice kata, you can add an additional parameter to specify agg function.

like aggfuc= sum\mean\std ...

Just say it bold>

Just ask, List is built-in list function >?

Thanks for your mention. Just for my case of different versions, so sometimes import built-in supported in my editor :)

Purpose to Encourage the functools module?

something goes wrong in the wiki-link

typo in examples, "inside" should be "outside"

Agree! Few katas like this, programing with fun!

lack of testcases...

Very grateful for this kata.
I'd love to see more katas about NLP.