let year = 1978
year += 10 // add 10 to 1978
year -= 8 // subtract 8 from 1988 = 1980
year /= 2 // divide 1980 by 2 = 990
year *= 4 // multiply 990 by 4 = 3960
let value = 2
// shift 1 bit to right
// same as 2 * 2 * 2
value <<= 2
// shift 1 bit to left: dividing
// same as 8 / 2
value >>= 1