Jade’s first-class conditional syntax allows for optional parenthesis, and you may now omit the leading - otherwise it’s identical, still just regular javascript:

- var user = { description: 'foo bar baz' }
- var authorised = false
if user.description
h2 Description
p.description= user.description
else if authorised
h2 Description
User has no description,
why not add one...
h1 Description
p.description User has no description
<div id="user">
<p class="description">foo bar baz</p>

Jade also provides a negated version unless (the following are therefore equivalent):

unless user.isAnonymous
  p You're logged in as #{}
if !user.isAnonymous
  p You're logged in as #{}