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In this article, the author praised functional programming with 2 main good features.
But he didn’t mention (Common) Lisp.
Does Lisp’s data meet this “all data is immutable”?
In Common Lisp you have the option of using a functional style. Avoid
setf,setq, and the like, and you’ve got a functional programming language. In other words, don’t change any variable values, don’t change the contents of compound data structures (cons, vectors, structures, etc) after creation. Functions take input and produce output without modifying state.So, while Common Lisp provides operations that are imperative you don’t need to use them if you don’t want to.