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Alex Rivera
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I am currently working through SICP with Haskell. Exercise 1.15 asks how many times a function is called. The idea is probably that you should use the substitution method, but I would like to know how to do so in code. In an imperative language one can keep a global variable and increment it every time the function is called. But how would you go about it in Haskell (or the pure functional way)?
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