How you define this code ?

Question

var x = 5;
var y = x++;
alert(x++ + y-)
How you define this code ?
I mean why the y- = 4?

Thank you!

Answer 1

line 2 : y is set to 5
(and then increments x to 6)
line3 : y-- decrements y by 1
and x++ increments x to 7
then
alert display the sum 7+4

Answer 2

Thanks