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A dynamic, open source programming language with a focus on simplicity and productivity. It has an elegant syntax that is natural to read and easy to write. - Ruby Docs
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Good read for those still new to Ruby.
Discovering the Differences Between Blocks, Procs and Lambdas - SitePoint Premium
I tried https://github.com/gurgeous/kdtree but it doesn't return accurate results. I alos cross checked the results with Java and Python implementations.
Some interesting things you may or may not know about Ruby.
15 Weird Things About Ruby That You Should Know
Find out how to write test-driven code that interacts with vendor APIs, using AWS Ruby SDK and DynamoDB as an example.
Stubbing the AWS SDK - Semaphore
Good overview on microservices architecture with Ruby.
Guide How to Setup a Microservices Architecture | Toptal