As mentioned in my previous blog, I just built up a simple online Blackjack game based on Sinatra. Here is the link and you can play with it. Sinatra is a DSL to build up web applications quickly in Ruby with minimal efforts. It’s such a great tool that I want to write a post-it note.

Include the gem require 'sinatra' and then gem install sinatra

Routes

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get '/' do
  ...code...
end

post '/' do
  ...code...
end

Render template

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erb :index
# Disable default layout
erb :index, layout: false

Helpers

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helpers do
  ...code...
end

Before filter

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before do
  ...code...
end

Halt the request

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halt erb(:index)

For more information, check out its official intro.