Question
Can some one please describe the usage of the following characters which is used in ERB file:
<% %>
<%= %>
<% -%>
<%# %>
what's the usage of each one ?
Answer
<% %>
Executes the ruby code within the brackets.
<%= %>
Prints something into erb file.
<%== %>
Equivalent to <%= raw %>
. Prints something verbatim (i.e. w/o escaping) into
erb file. (Taken from [Ruby on Rails
Guides](https://edgeguides.rubyonrails.org/active_support_core_extensions.html#output-
safety).)
<% -%>
Avoids line break after expression.
<%# %>
Comments out code within brackets; not sent to client (as opposed to HTML comments).
Visit Ruby Doc for more infos about ERB.