should I have done something different?

fork

no random tests

i remember when i first learned what functions were, i wondered, "could one somehow share its results..."

always gives me a bit of a laff

your code does not use the Python sum, it defines that name as a variable to hold an integer

but FYI that's a bad coding practice because you overwrite the built-in function of that name

but that's not the error message I see when I run your code, it's:

'consecutive CApitals' should equal 'consecutive C Apitals'

showing a space between C and A

I implemented this method in the editor, then copied it here.

aha! the first other code I could find besides mine with "no strings attached"

that's because of indentation / scope

in your code

ya gotta count the 1's in the binary of a number

is what it says

then they show that there's 5 1's in the binary of 1234...

so

hi, I put the spoiler flag on your comment.

you must use it otherwise anyone can read your method / solution / technique / code / et cetera

to know HOW certain functions work is incredibly enlightening, and can advise you on managing aspects of performance in your code.

knowing when / how / why to use the correct built-in Vs. writing out an algorithm is a higher level concept...

...or so I perceive

C Translation

there's a technique where you easily can find out on the internet

https://en.wikipedia.org/wiki/Evaporator

Also, I enjoyed the challenge; learned something useful about JavaScript & coding in general, then just had fun with my Python solution.