Sorry for this question, i think its more offtopic, but i couldn't find anything on google!
I saw now multiple times that a lot of people use -%> instead of just %>. Whats the sense?
Example:
<% @images.each_slice(6) do |slice| -%>
<div class="gallery">
<% slice.each do |image| -%>
<%= image_tag(image.url, :alt => image.alt) %>
<% end -%>
</div>
<% end -%>
Source: Rails each loop insert tag every 6 items?
Here he has also used -%> for all blocks.
I would like to add some resources that I know about ERB :
Rails extends ERB, so that you can suppress the newline simply by adding a trailing hyphen to tags in Rails templates:
<ul>
<% for @item in @items -%>
<li><%= @item %></li>
<% end -%>
</ul>
Comment markers use a hash sign:
<%# This is just a comment %>
A tag with an equals sign indicates that enclosed code is an expression, and that the renderer should substitute the code element with the result of the code (as a string) when it renders the template. Use an expression to embed a line of code into the template, or to display the contents of a variable:
Hello, <%= @name %>.
Today is <%= Time.now.strftime('%A') %>.
With one equal sign the string will be encoded. To avoid encoding, you can use two equals signs (or raw):
Hello, <%== @unencodedOutput %>
Tags without the equals sign denote that the enclosed code is a scriptlet. Each scriptlet is caught and executed, and the final result of the code is then injected in to the output at the point of the scriptlet.
<ul>
<% for @item in @shopping_list %>
<li><%= @item %></li>
<% end %>
</ul>
Scriptlets are most commonly used for embedding loops or conditional logic into templates:
Read An Introduction to ERB Templating to know more.
