It's cool how the random tests test for tens of thousands of electrons. Can an atom actually be that powerful? Haha.

s contains 2 electrons, p has 6, while d can hold 10. 3d has a higher energy state than 4s, so 4s gets filled first, then goes 3d. Are you referring to this? I think the kata simplified this to avoid using the (s + 0.7 * l) formula. (If I correctly remember this thing from my middle school chemistry class.

Added some time ago

Why would the average of no numbers be 0 ? Why not 1234 or -8888 ;-) ?
I added a note in the description that promises the array will not be empty, and I removed the fixed test in Clojure that was testing for it.

This is a implicit int, the default return type is int. You can do this with arguments as well like
fun(a, b) {return a + b;}
This defined a function called fun, that return int and take a and b as integers.

The problem asked to use the filter function. How did this code past the "filter in code" test?

A hidden gem of a comment thread, learnt some cool stuff - thanks @awesomead and @lechevalier

Now added, closed

fixed

I agree with that; I've made a fork with fixing that problem

its because easy jobs are hard for us ;-;

It's no use to post duplicate suggestions. Old suggestions don't disappear and are easy to find out.

I've posted the Python translation of this kata 8 months ago. Could it plz be checked and approved/rejected?