czajkovsky

.post {
  background: blue;
  &__title {
    background: red;
  }
}

czajkovsky

.post {
  background: blue;
}
.post__title {
  background: red;
}

czajkovsky

$alerts: (error, red, 1px),
         (success, green, 2px),
         (info, blue, 2px);
@each $type, $color, $border-width in $alerts {
  .alert--#{$type} {
    border: $border-width solid $color;
  }
}

czajkovsky

$alerts: (
  error: red,
  success: green,
  info: blue
);

.alert-error {
  background: map-get($alerts, error);
}

czajkovsky

#nav
  %h1 Netguru front-end rekru
  
#users{ style: "background: #f00" }
  %a{ href: 'http://sample.com/czajkovsky' }
    #user.id_13
      .user__id 13
      .user__name Mateusz Czajka
  %a{ href: 'http://sample.com/olabee' }
    #user.id_14

czajkovsky

%ol
  %li
  %li
  %li
  %li
  %li
  %li
  %li
  %li
  %li

czajkovsky

.foo
  .square
.foo
  .circle
.foo
  .rectangle
    .circle-2

czajkovsky

# lib/my_gem/railtie.rb
module CreatingAGem
  class Railtie < Rails::Railtie
    # for example, if you want to extend ViewHelpers
    initializer 'creating_a_gem.view_helpers' do
      ActionView::Base.send :include, ViewHelpers
    end
  end
end

czajkovsky

├── app [+]
├── apps
│   └── internal_api
│       └── lib

czajkovsky

#config/routes.rb
 
Aaewebinar::Application.routes.draw do
  root to: 'application#index'
 
  mount InternalApi::Engine, at: :internal_api #<- this line right here!
end