> Any expression can be evaluated with eval.

As, indeed, can self-evaluating forms:


user=> (eval 3)
3
user=> (eval (eval (eval (list + 1 2))))
3
user=> (eval :foo)
:foo
user=> (eval '+)
#<core$_PLUS___3949 clojure.core$_plus___3...@1d05c9a1>
user=> (eval 'eval)
#<core$eval__4610 clojure.core$eval__4...@4ef5c3a6>


This kind of fiddling around in a REPL is very enlightening.

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