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Discussion on: There's no "else if" in JS

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Nathan

Unlike Haskell, JavaScript is not a purely functional language. Functions such as filter are recent additions to the language. If you look at the V8 source code for the filter function, you'll see this comment: "The following functions cannot be made efficient on sparse arrays while preserving the semantics."

github.com/v8/v8/blob/73c9be9b31d2...