The simple dropdown menu doesn’t work

<p>I’m a beginner on ruby on rails. I read a Michael Hart’s tutorial, and i copied the exercise about the login user that shows a dropdown menu whith 2 options. But when the exercise is executed it didn’t show those options.</p>

The files are:

Gemfile:

source 'https://rubygems.org'

git_source(:github) { |repo| "https://github.com/#{repo}.git" }

gem 'rails', '6.0.2.2'

gem 'jquery-rails'

gem 'bcrypt', '3.1.13'

gem 'puma', '3.12.2'

gem 'sass-rails', '5.1.0'

gem 'webpacker', '4.0.7'

gem 'turbolinks', '5.2.0'

gem 'jbuilder', '2.9.1'

gem 'bootstrap-sass'

gem 'bootsnap', '1.4.5', require: false

...

```

app/views/layouts/application.html.erb:

<%= full_title(yield(:title)) %>

<%= stylesheet_link_tag "application", media: "all", "data-turbolinks-track" => true %>

<%= javascript_include_tag "application" "data-turbolinks-track" => true %>

….

app/assets/javascripts/application.js:

///= require jquery

//= require jquery_ujs

//= require bootstrap

//= require turbolinks

app/assets/stylesheets/custom.css.scss:

@import "bootstrap-sprockets";

@import "bootstrap";

….

![header|200x150](upload://f50WOHPjbuTvackgfjnVG9bAIBv.png)

The app doesn’t show any error, but it doesn’t show the dropdown menu.

Do you have any idea to resolve this issue? Thank you very much.

There is a syntax error in application.js

1st line should be: //= require jquery