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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Well, if you're programming in Ruby, a great place to start is the Ruby Science book by ThoughtBot. It's a bottom-up approach to improving your code by identifying code smells and applying OO principles to fix them. Identifying smells in your own code will lead you to the OO principles that you need to learn to build your OO skills.
The above allocates a Proc up to MRI 3.1, but doesn't in 3.2. https://github.com/ruby/ruby/pull/6286.
NOTE:
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Hence, a higher number means a more popular project.