I think this is the best practice because we replace the rest of the letters with lowerCase

Op solved it, closing

lol

Thank you! This should really be in the description, especially since the example tests don't cover colors with digits A-F in them.

OMG thank you!

good explanation, thanks for clarifying. There's a typo in your [0, 4] example. You've got the 0th and 5th bits.

Very clear explanation, thank you.

thank you sir

Little hint for somebody who stuck here for couple of days (as I did): the result has to be in upper case

Oh, thanks a lot, man!
I did the kata in 2 minutes after your explanation)
The instructions for this are incredibly vague and error suggests doesn't help much either :(

I'm not a native speaker either but how I understood it:

You changed the line

var result = simpleVariable + variableInLoop + variableInFunction;

You aren't supposed to change that line. To tamper with something is to change or touch it in an unwanted or bad way. In that line you are adding (+) some things to each other. So what the message is saying is: "You have made a change somewhere where change was not allowed. This forbidden change was made somewhere where things are being added together."

Tempering I think is some strange process that involves steel? idk

Sorry, can someone explain me what Addition statement been tempered means?
(I'm not a native english)

If someone (like me) can't understand what is this about after reading description and comments, here is some explanation about examples:

sortByBit([0, 1]):    00000000000000000000000000000011 -> 3 (0th and 1st bits)
sortByBit([0, 1, 2]): 00000000000000000000000000000111 -> 7 (0th, 1st and 2nd bits)

and

sortByBit([0, 4]):    00000000000000000000000000100001 -> 17 (0th and 4th bits)

It looks like the length of the array is 37, not 30. You must include all elements of the array, as explained.

return the index such that the sum of the elements to the right of that index equals the sum of the elements to the left of that index.

Hello!
Can't understand why random test

peak(([4,6,4,10,4,7,2,9,9,4,1,10,1,10,7,7,6,4,5,3,6,1,15,9,8,10,10,10,1,6,1,3,9,13,3,13,5]);

should return -1?

first 16 items 4,6,4,10,4,7,2,9,9,4,1,10,1,10,7,7,6 sum is 101
last 14 items 9,8,10,10,10,1,6,1,3,9,13,3,13,5 sum is 101
so my solutions returns 17.

Why it wrong?