clojure.core/macroexpand-1

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Type: function Added: Clojure 1.0 Examples: 3 Runnable: 0

([form])

If form represents a macro form, returns its expansion, else returns form.

Examples

by gstamp on 2010-10-05 . May have evaluation errors. ▶

(macroexpand-1 '(defstruct mystruct[a b])) (def mystruct (clojure.core/create-struct [a b]))

by BertrandDechoux on 2012-06-09 . May have evaluation errors. ▶

(macroexpand-1 '(-> c (+ 3) (* 2))) (clojure.core/-> (clojure.core/-> c (+ 3)) (* 2))

by cloojure on 2017-05-06 . May have evaluation errors. ▶

; When testing macro expansion in a file instead of at the REPL, ; please note that it may be necessary to use a backquote ; instead of a straight quote. (defmacro iiinc [x] `(+ 3 ~x)) (deftest t-stuff ; This doesn't work. (println (macroexpand-1 '(iiinc 2))) ;=> (iiinc 2) ; Oddly, we can use the macro itself fine in our tests... (println (iiinc 2)) ;=> 5 (is (= 5 (iiinc 2))) ;=> unit test passes ; This fixes it by resolving the symbol iiinc at compile-time. (println (macroexpand-1 `(iiinc 2)))) ;=> (+ 3 2) ; Also, as the previous examples show, please remember that ; you must quote the form you are providing to `macroexpand-1`.

See also

• clojure.core/macroexpand (0)
• clojure.walk/macroexpand-all (1)

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