Determining if the element is the last child of its parent
Solution 1:
Use :last-child selector together with .is()
$('#c').is(':last-child')
Solution 2:
You can use .is() with :last-child like this:
$('#b').is(":last-child"); //false
$('#c').is(":last-child"); //true
You can test it here. Another alternative is to check .next().length, if it's 0 it's the last element.
Solution 3:
if($('#b').is(":last-child")){
}