Question

Going over source code written in Ruby, like Rails, I often see that small code is wrapped with tt tag, like in rails/activesupport/core_ext/array/access.rb

  # Equal to <tt>self[2]</tt>.
  #
  #   %w( a b c d e).third # => "c"
  def third
    self[2]
  end

What is the convention behind this, when and why it was decided to use this notation?

Answer 1

Yep, my mistake, sorry

This is a part of special RDoc system.

Non-verbatim text can be marked up:
italic: word or <em>text</em>
bold:   word or <b>text</b>
typewriter: word or <tt>text</tt>

Read more about it here