Sinatra with caching example

sinatra.rb

require 'sinatra/base'
require 'concurrent'

class App < Sinatra::Application # or ::Base for fewer features
  configure do
    set :cache, Concurrent::Hash.new(0)
  end

  get '/?:word?' do
    word = params[:word]
    count = settings.cache[word] += 1
    "`#{word}` was called #{count} times"
  end
  
  run! if app_file == $0
end