I am super confused?

Question

var num=0;
for (i = 0; i <= 10; i++) {
if (i == 10) {
break;
}
//document.write(i + "<br />");
num += i;
}
document.write(num)

When I print the (num) the output is 45? If I change i==5 the output is 10?? Am I missing something here?

Answer 1

when, i == 5 it will obviously break the loop so the 5 will not be incremented on the num.

That's why the value added on num are

0 + 1 + 2 + 3 + 4 = 10

Answer 2

0+1+2+3+4+5+6+7+8+9=45

Answer 3

When i =0+1=1
1+2=3
3+3=6
6+4=10
10+5=15
15+6=21
21+7=28
28+8=36
36+9=45