Ruby Do loop and iteration

Question

Is there a built-in method for writing record numbers so that I do not have to create a variable and increase it? Just developing practices at this point. file.recnumber?

<% i = 1%>
<% @files.each do |file| %>

<%= i %>. <%= file %> (<%= file.size %>)k<br /> 
<% i = i + 1%>

<% end %>

Answer 1

Actually, io objects and file objects do have a lineno method.

File.open("test.txt") do |file| 
  file.each{|line| puts "#{file.lineno}: #{line}"}
end

Answer 2

I think you're looking for each_with_index, which passes the index as the second argument to the block.

If you want to do something more sophisticated than each, recent versions of Ruby also include a with_index method that you can chain onto any Enumerable method to get a version with the index. For example:

('a'..'z').map.with_index {|letter, index| "#{index} #{letter.upcase}" }

Answer 3

Another alternative is to just use an HTML ordered list:

<ol>
<% ["one", "two", "three"].each do |file| %>
  <li>file <%= file %></li>
<% end %>
</ol>

Will give you something like the following, which you can easily style with CSS:

1. file one
2. file two
3. file three

Answer 4

<% files.each_with_index do |file, index| %>
    ...
<% end %>