Helper for creating css class strings inspired by ReactJS classSet

• Pass bare arguments for default classes
• Pass hash of class => <boolean> for conditional classes
• Use array with two classes as a key and first will be used for truthy and second for falsey value [:true?, :false?] => <boolean>

Add this line to your application's Gemfile:

gem 'css-class-string'

  // @boolvalue = true
  %span{class: class_string({some: true, classy: false, [:truthy, :falsy] => @boolvalue})}
  // equal to
  %span{class: class_string('some', falsy: false, [:truthy, :falsy] => @boolvalue)}
  // => <span class="some truthy"></span>

  <!-- @boolvalue = false -->
  <span class="<%= class_string({some: true, classy: true, [:truthy, :falsy] => @boolvalue} %>">
  <!-- equal to -->
  <span class="<%= class_string('some', 'classy', [:truthy, :falsy] => @boolvalue %>">
  <!-- => <span class="some classy falsy"></span> -->

Outside a view

CssClassString::Helper.new({}).to_s

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request