gistfile1.txt

//https://www.codewars.com/kata/596d34df24a04ee1e3000a25
const countOnes = (a, b) => cab(b) - cab(a - 1);

const cab = n => {
  let bits = 0;
  for (let i = 0; i < 30; ++i) 
    bits += ccb(i, n);
  return bits;
}

const ccb = (col, n) => {
  const div = (n + 1) / (2 << col);
  const sum = Math.floor(div);
  const rest = Math.max(0, (div - sum) * (2 << col) - (1 << col));
  return sum * (1 << col) + rest;
}