Ruby on Rails

"Agile Web Development with Rails 5", p.76 lists a form partial which
begins:

<%= form_for(product) do |f| %>
<% if product.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(product.errors.count, "error") %> prohibited
this product from being saved:</h2>

<ul>
<% product.errors.full_messages.each do |message| %>
<li><%= message %></li>

It is correct but I'm confused about the first line as I understood that
control structures begin with <% as in the 2nd line and that <%= is
reserved for inserting values and calling formatting functions.

gvim

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