Jimmy's Ruby on Rails Quest: I learned the basics of Ruby language

Today, I finished up the chapter 4 of the book: Rails-flavored Ruby https://www.railstutorial.org/book/rails_flavored_ruby#cha-rails_flavored_ruby.

In refer to the instructions from the book:

* I created a separate topic branch "rails-flavored-ruby"

$ git checkout -b rails-flavored-ruby

* I defined a custom helper called full_title, to solve the problem of a missing page title.
app/helpers/application_helper.rb

module ApplicationHelper

# Returns the full title on a per-page basis.
def full_title(page_title = '')
    base_title = "Ruby on Rails Tutorial Sample App"
    if page_title.empty?
      base_title
    else
      page_title + " | " + base_title
    end
end
end

* I simplified my application layout
app/views/layouts/application.html.erb

<!DOCTYPE html>
<html>
<head>
    <title><%= full_title(yield(:title)) %></title>
      <%= csrf_meta_tags %>
    <%= stylesheet_link_tag    'application', media: 'all', 'data-turbolinks-track': 'reload' %>
    <%= javascript_include_tag 'application', 'data-turbolinks-track': 'reload' %>
</head>

<body>
    <%= yield %>
</body>
</html>

* I eliminated the code repeatation in Home, About and Contact for the test cases in the static pages controller:
test/controllers/static_pages_controller_test.rb

require 'test_helper'

class StaticPagesControllerTest < ActionDispatch::IntegrationTest

def setup
    @base_title = "Ruby on Rails Tutorial Sample App"
end

test "should get root" do
    get root_url
    assert_response :success
end

    test "should get home" do
    get static_pages_home_url
    assert_response :success
    assert_select "title", "Ruby on Rails Tutorial Sample App"
    end

test "should get help" do
    get static_pages_help_url
    assert_response :success
    assert_select "title", "Help | #{@base_title}"
end

test "should get about" do
    get static_pages_about_url
    assert_response :success
    assert_select "title", "About | #{@base_title}"
end

test "should get contact" do
      get static_pages_contact_url
      assert_response :success
      assert_select "title", "Contact | #{@base_title}"
end

end

* And then, I read the introduction of Ruby programming language including methods, objects, class, def keyword, class keyword, HTML embedded Ruby ERB, data structures include arrays, ranges, hashes, inheritances, superclass, and etc. I did not do the Ruby programming exercises.

* After that, I commited the changes, and I merged the rails-flavoured-ruby branch to master: