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Also, keep in mind that understanding how each different computer programming language is used in the real-world will help you prioritize your learning experience.
For example, Drost informs that, "(Ruby on) Rails is increasingly being relegated to the API layer, and it offers very little support and structure for those hoping to build rich client apps." This is not to say that Ruby on Rails isn't an awesome language, only that it serves a different, unique purpose that is not as widely used.