JavaScript "I would like to understand why the output is 7"

Question

function calc(j,p) {
j *= p++;
return j+p;
j-= p;
}
alert(calc(2,2));

output is 7

Answer 1

First of all.. j = j * p++... j = j * p, which makes j = 4.. But because ++ is in the end is incremented after assignment so p is 3.. Then the function returns 4 + 3 which is 7.. Everything after return is ignored...

Answer 2

thanks