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I wouldn't say Common Lisp is a esoteric language. Esoteric makes me think Brainfuck and other similar languages. Common Lisp and lisps in general are languages you can be productive in, in a "building a product" sense, which you cannot say about most esoteric languages.

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The author himself says it’s esoteric

He didn't.

He wrote: 'Contrary to popular opinion, Lisp is an incredibly practical language for building production systems.'

Also, if you’re really willing to go into it you could be productive in Brainfuck. Doesn’t mean it applies to the general crowd.

It’s not a good comparison at all. Learning lisp or understanding it is a good base knowledge regardless of your primarily language. It’s not a language that’s truly esoteric and difficult to reason about by nature. Metaprogramming/macros can be difficult for those inexperienced, but not impossible. Esoteric languages are often created to either use unfamiliar syntax compared to common languages or unfamiliar paradigms to those. In the end, a lot of things are very similar in nature with esoteric languages, just a very different way, with syntax that’s not as readable as common languages. Lisp is certainly readable and easy to grin even if you have little knowledge of the language

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