What is the difference between <%, <%=, <%# and -%> in ERB in Rails?

Question

Can some one please describe the usage of the following characters which is used in ERB file:

<%   %>
<%=  %>
<%  -%>
<%#  %>
         


        

Answer 1

These are use in ruby on rails :-

<% %> :-

The <% %> tags are used to execute Ruby code that does not return anything, such as conditions, loops or blocks. Eg :-

Names of all the people
<% @people.each do |person| %>
  Name: <%= person.name %>

<% end %>

<%= %> :-

use to display the content .

Name: <%= person.name %>

<% -%>:-

Rails extends ERB, so that you can suppress the newline simply by adding a trailing hyphen to tags in Rails templates

<%# %>:-

comment out the code

<%# WRONG %>
Hi, Mr. <% puts "Frodo" %>