Please explain this JS challenge...

Question

What is the output of this code?

var x = 8;
var y = x++ * 5;
var z = y % x;
alert(z);

Answer 1

Thanks! Output 4 is correct. So x++ only increments after x*5 is assigned to y. Is there a rule?

Answer 2

Yes. Examples:

var x = 5;
alert(x++);
alert(x);
// the output is 5 and 6

var x = 5;
alert(++x);
alert(x);
// the output is 6 and 6