• Recursion is not supported?

function binaryCount(number) { return number ? (number & 1) + binaryCount(number >> 1) : 0; }

Works correctly in run mode, but fail test2 in check mode :(((

From: https://js.checkio.org/mission/binary-count/solve/

HTTP_USER_AGENT:

Mozilla/5.0 (Windows NT 6.3; WOW64; rv:46.0) Gecko/20100101 Firefox/46.0