Can someone please explain why this code alerts 12? I can't quite get my head around it

Question

var k = 6;
for (var i = 0; i < k; i++) {
k += 0.5;
}
alert(i);

Answer 1

If you go through the whole loop, it's easier:

i = 0, k = 6
i = 1, k = 6.5
i = 2, k = 7
i = 3, k = 7.5
i = 4, k = 8
i = 5, k = 8.5
i = 6, k = 9
i = 7, k = 9.5
i = 8, k = 10
i = 9, k = 10.5
i = 10, k = 11
i = 11, k = 11.5
i = 12, k = 12,
therefore i will be 12