Was blind to a misnamed variable while writing this.

base is being used as an exponent here

What if the hd doesn't fill and we overrun the sizes array?

hd -= undefined hd becomes NaN,
NaN >= 0 is false so the while loop ends correctly

Yay JavaScript (this time)

I like your solution - clever :D

How would you update the object "not in place"?

JavaScript - "write a function that adds the username property to each object in the input array"

Is still unclear if we are meant to update the objects in place or not

x is pairs of mating bears

not number of mating bears
not total number of bears in the park

number of mating pairs of bears

(JS)

This issue caused some very strange expected results on the tests.