/node_modules/jade/testing/index.jade

 1users = [{ name: 'tobi', friends: ['loki'] }, { name: 'loki' }]
 2
 3ul
 4  for user in users
 5    li= user.name
 6      ul
 7        for friend in user.friends
 8          li= friend
 9        else
10          li no friends!
11  else
12    li no users!