require "erb" # Build template data class. class Product def initialize( code, name, desc, cost ) @code = code @name = name @desc = desc @cost = cost @features = [ ] end def add_feature( feature ) @features << feature end # Support templating of member data. def get_binding binding end # ... end # Create template. template = %{ Ruby Toys -- <%= @name %>

<%= @name %> (<%= @code %>)

<%= @desc %>

<%= f %>

<% if @cost < 10 %> Only <%= @cost %>!!! <% else %> Call for a price, today! <% end %>

}.gsub(/^ /, '') rhtml = ERB.new(template) # Set up template data. toy = Product.new( "TZ-1002", "Rubysapien", "Geek's Best Friend! Responds to Ruby commands...", 999.95 ) toy.add_feature("Listens for verbal commands in the Ruby language!") toy.add_feature("Ignores Perl, Java, and all C variants.") toy.add_feature("Karate-Chop Action!!!") toy.add_feature("Matz signature on left leg.") toy.add_feature("Gem studded eyes... Rubies, of course!") # Produce result. rhtml.run(toy.get_binding) # From https://docs.ruby-lang.org/en/2.3.0/ERB.html#class-ERB-label-Examples