hunk.code_window:   if (releaseChannel === undefined) return App.apiUrl.dev // since releaseChannels are undefined in dev, return your default.
     if (releaseChannel.indexOf('prod') !== -1) return App.apiUrl.prod // this would pick up prod-v1, prod-v2, prod-v3
     if (releaseChannel.indexOf('staging') !== -1) return App.apiUrl.staging // return staging environment variables
   }
   ```
   You can do this for any amount of environment variables, too and return an entire object instead of just the url.
  
hunk.labels: keep keep keep keep replace replace replace
hunk.after_edit: ```
  
hunk.file_path: docs/versions/unversioned/guides/release-channels.md
hunk.type: replace
file: /*=============================================================================
      Copyright (c) 2001-2011 Joel de Guzman
      Copyright (c) 2009 Christopher Schmidt
  
      Distributed under the Boost Software License, Version 1.0. (See accompanying
      file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  ==============================================================================*/
  
  #ifndef BOOST_FUSION_CONTAINER_SET_DETAIL_END_IMPL_HPP
  #define BOOST_FUSION_CONTAINER_SET_DETAIL_END_IMPL_HPP
  
  #include <boost/fusion/support/config.hpp>
  #include <boost/fusion/iterator/basic_iterator.hpp>
  
  namespace boost { namespace fusion { namespace extension
  {
      template <typename>
      struct end_impl;
  
      template <>
      struct end_impl<set_tag>
      {
          template <typename Seq>
          struct apply
          {
              typedef
                  basic_iterator<
                      set_iterator_tag
                    , typename Seq::category
                    , Seq
                    , Seq::size::value
                  >
              type;
  
              BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
              static type
              call(Seq& seq)
              {
                  return type(seq,0);
              }
          };
      };
  }}}
  
  #endif
  