Good software APIs should reflect the mental models of domain experts: the syntax should match the most intuitive and most effective way to think about the underlying problem.
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The most powerful mental models are hierarchical: simple at a high level, but highly precise when you need to zoom in.
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A side effect is that good APIs are modular and hierarchical -- they feel simple at a high level, but they are precise & expressive when you need it.
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Tools are a reflection of how to think about problems. Good tools are shaped by good mental models, and in turn, they shape the way of thinking of their users.
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To zoom in at different levels, i.e. more than once, i.e it's not "all or nothing"
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We all traverse the hierarchies fluidly up - inductive reasoning and down- deductive, while the brightest people are able to traverse multiple hierarchies - analogy. Genius ditches one hierarchy for entirely new ones.
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Could be foveated, instead of hierarchical, too. At minimum certain parts of biological perception prefers fovea over an explicit hierarchy. https://arxiv.org/pdf/1611.09430.pdf …
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