Why would this be more efficient?

Everything in Ruby is an object even numbers (Integer and Float classes)
As @Unihedron stated, you can define methods such as +(other), -(other), %(other)
You can even change + to do other operation (which is ofcourse a bad idea)

110% efficiency

hahaha

What in tarnation

Currently no. Also, I believe, there's already such suggestion on CW github.

right... but it didn't work! :D
Now I tried to figure out why...

main.rb:4:in 'each': undefined method 'self' for "a":String (NoMethodError) Did you mean? itself

as it turns out group_by(&:itself) works ;)

explain please

group_by(&:self) is a nice improvement. :)

is it possible to search for kata using specific language?
For example if I wanted to search for Ruby kata, excluding any tranlsated ones.

thanks!

the best solution

Now you have. Operators in ruby are also defined as methods, so you can use them as methods a*b -> a.*(b) or redefine their methods def *(v)this*v end.

Before using any Ruby features, you should check since which version of Ruby they're available. And definitely not asserting any "errors" on arbitrary "not for production" excuses, it's not helpful at all ;-)

In this case, it's only available since 2.3.

It's seems doesn't work in older ruby version. I've tried with 2.2.3 version, it's a syntax error.
Maybe this is not a tick for production but quite nice trick.