add gem rubocop

Gemfile

@@ -42,6 +42,7 @@ group :development, :test do
 end
 
 group :development do
+  gem 'rubocop'
   # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
   gem 'web-console', '>= 3.3.0'
   gem 'listen', '>= 3.0.5', '< 3.2'

Gemfile.lock

@@ -47,6 +47,7 @@ GEM
     archive-zip (0.12.0)
       io-like (~> 0.3.0)
     arel (9.0.0)
+    ast (2.4.1)
     bindex (0.8.1)
     bootsnap (1.4.6)
       msgpack (~> 1.0)
@@ -106,6 +107,9 @@ GEM
     nio4r (2.5.2)
     nokogiri (1.10.10)
       mini_portile2 (~> 2.4.0)
+    parallel (1.19.2)
+    parser (2.7.1.4)
+      ast (~> 2.4.1)
     pg (1.2.3)
     pry (0.13.1)
       coderay (~> 1.1)
@@ -144,12 +148,26 @@ GEM
       method_source
       rake (>= 0.8.7)
       thor (>= 0.19.0, < 2.0)
+    rainbow (3.0.0)
     rake (13.0.1)
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     ref (2.0.0)
     regexp_parser (1.7.1)
+    rexml (3.2.4)
+    rubocop (0.88.0)
+      parallel (~> 1.10)
+      parser (>= 2.7.1.1)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.7)
+      rexml
+      rubocop-ast (>= 0.1.0, < 1.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 1.4.0, < 2.0)
+    rubocop-ast (0.2.0)
+      parser (>= 2.7.0.1)
+    ruby-progressbar (1.10.1)
     ruby_dep (1.5.0)
     rubyzip (2.3.0)
     sass (3.7.4)
@@ -190,6 +208,7 @@ GEM
       thread_safe (~> 0.1)
     uglifier (4.2.0)
       execjs (>= 0.3.0, < 3)
+    unicode-display_width (1.7.0)
     web-console (3.7.0)
       actionview (>= 5.0)
       activemodel (>= 5.0)
@@ -219,6 +238,7 @@ DEPENDENCIES
   puma (~> 3.11)
   rails (~> 5.2.4, >= 5.2.4.3)
   rails_12factor
+  rubocop
   sass-rails (~> 5.0)
   selenium-webdriver
   spring

lib/src/interface_web.rb

@@ -4,8 +4,8 @@ class Interface_web
     data = []
     website_companies = []
     website_jobs = []
-    num_page_will_crawl = page
-    num_page_will_crawl.times do |i|      
+    
+    page.times do |i|      
       page = Nokogiri::HTML(URI.open("https://careerbuilder.vn/viec-lam/tat-ca-viec-lam-trang-#{i+1}-vi.html"))
       website_companies << page.search(".figcaption .caption a/@href").text.to_s.split('https://careerbuilder.vn/') 
       website_jobs << page.search(".figcaption .title .job_link @href").text.to_s.split('https://careerbuilder.vn/')