Number (4): Everything in this space must add up to 4. The answer is 2-4, placed horizontally.
Before diving into implementation details you can simulate how Sabela works in GHCi yourself. Doing so will help you get a better intuition of the library’s design choices.
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Companies and key developers
This is one of the few modern books that address the topic of Modularity. While it also presents some patterns I found less practical (e.g. SOLID), I highly recommend reading it.
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