This example in the book:

case hero.role
  when 'captain'
    div Yarr!
  when 'hacker'
    div w00t!
  default
    div Avast!

might be too simple for some beginners to make sense. This one should give you more context:

- for (var i in heroes) {

    hero = heroes[i]

    if hero.role == 'captain'
      .msg Aye Captain!
    else if hero.role == 'hacker' && hero.name != 'Napman'
      .msg Who goes there?
    else
      .msg Avast!
- }