Looping Problem

Question

for(var i=0;i<=10;i+=2){
}
document.write(i);

i know the answer is 12, but when i try this :

for(var i=0;i<=10;i+=3){
}
document.write(i);

why i still 12 ??

Answer 1

Because the iterator is incremented like this:
0, 3, 6, 9, 12 - oh, not smaller than or equal to 10 anymore, time to leave the loop.

Answer 2

Because 12 is the first multiple of both 3 and 2 to be greater than 9...