How the output is 7?

Question

var x = 7;
var y = x++;
var z = y++ % x;

alert(z);

7 will be alerted. but i don't understand how the z will be 7?

Answer 1

x=7
y=7; x=8
z=7%8=7; y=8

alert(z) = 7

Answer 2

learn about prefix, postfix in increment and decrement. it will helps a lots about this concept.