jQuery: iterate over nested elements using each

Question

i have this basic html structure:

<div class=a>
  <div class=m></div>
  <div class=m></div>
</div>
<div class=b>
  <div class=m></div>
  <div class=m></div>
</div>

now i want to iterate over all m's but also would like to know if i am in a or b. using basic jquery syntax each i fail to do find this out.

$('.m').each(function(index) {
    // how do i know if this m is part of a or b ?
});

Answer 1

$(this).parent().hasClass("a") or $(this).parent().hasClass("b")

Answer 2

if($(this).parent().hasClass('a'))

And same for b, it should work.