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InfluxDB
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There are a lot of really good "learn by doing" initiatives out there which are also theory heavy, even in the hardest languages (like this kind of thing for Haskell). Learning by immersion is the way they teach language in a hurry, and to learn a programming language in a hurry immersion is still the best teacher (in the form of a lot of hands-on projects that force you to handle theoretical concepts to complete them). It's not just the fun of making things and problem solving, but also of putting the big picture together and increasing what you can do. I bet you can find immersion projects like that on GitHub (or the internet in general) for almost any language or framework (and good textbooks are similar).