Comments

Comments start with the # character. All following content up to the end of the line is part of the comment. Comments may be on their own line or follow after a Crystal expression (trailing comment).

  1. # This is a comment
  2. puts "hello" # This is a trailing comment

The purpose of comments is documenting the code. Public documentation, including autogenerated API docs, is a special feature based on comments and is described in Documenting Code.