const vectorToInt = V => {
  return parseInt(V.reverse().join(''), 2)
}

const calculate = (A, B) => {
  if (A === B)
    return A & B
  return calculate(A&B, B-1)
}

const f = (A, B) => calculate(vectorToInt(A), vectorToInt(B))

console.log(f([1,0,1], [1,1,1]))