Pug’s first-class conditional syntax allows for optional parentheses.

If you’re coming from Pug v1, you may now omit the leading -. Otherwise, it’s identical (just regular JavaScript):

Pug also provides the conditional unless, which works like a negated if. The following are equivalent:

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