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Clojure is a general-purpose language supporting interactive development that encourages a functional programming style, and simplifies multithreaded programming.

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In what programming language did "let" first appear?

Well, BASIC had LET for assignment as part of the syntax from the start in 1964, so that would predate the use of let in Lisp, which as Chris Jester-Young points out didn't appear until the 1970s acco …
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