Commits on Feb 6, 2018

1. Optimize Backend::Simple#available_locales …

   Previously available_locales was a little bit slow. For each locale in
   translations it would:
   * build a new array of all the top-level keys in that locale
   * build a second array of those keys except :i18n
   * add that locale to the list if the second array was not empty
   
   For locales with many translations this can build somewhat sizeable
   arrays.
   
   Instead we can perform the same operation, rejecting locales with either
   no keys or only :i18n without allocating any new objects. We reject
   based on the condition:
   
       data.size <= 1 && (data.empty? || data.has_key?(:i18n))
   
   This ends up being about 4x faster (though this of course depends on
   the exact locales being used):
   
       Benchmark.ips do |x|
         x.report("I18n.available_locales") do
           I18n.available_locales
         end
       end
   
   Before:
   
       11.447k (± 2.9%) i/s -     57.869k in   5.059738s
   
   After:
   
       47.810k (± 2.8%) i/s -    242.060k in   5.067332s

   

   jhawthorn committed Feb 6, 2018
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