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读书笔记 Lesson 2: Functions and functional programming

In most programming languages, variables are declared before they’re used. This convention in most programming languages is partially the byproduct of being able to change state. Variable order matters because you can always reassign the value of something after you’ve assigned it. In Haskell, because of referential transparency, this isn’t an issue. There’s also a readability gain with the Haskell approach: if you read the algorithm, the intention is clear right away.



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