Yup, the expected and actual output in the assertion are swapped, re-raised as an issue.

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.

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

Now added, closed

Decided to add tests from "Attempt" section to make hem more clear: https://www.codewars.com/kumite/630c7414966bf599e5dc7279

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.