I'll let you explain to the author of the book "Discover Functional Programming in JavaScript", Cristian Salcescu, that his code is impure (since, as I said in my post, the implementations are from his book).
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I'll let you explain to the author of the book "Discover Functional Programming in JavaScript", Cristian Salcescu, that his code is impure (since, as I said in my post, the implementations are from his book).