clojure.core/macroexpand

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Type: function Added: Clojure 1.0 Examples: 2 Runnable: 0

([form])

Repeatedly calls macroexpand-1 on form until it no longer represents a macro form, then returns it. Note neither macroexpand-1 nor macroexpand expand macros in subforms.

Examples

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

;; It is useful to combine macroexpand with pprint as the ;; default output can be hard to read. (clojure.pprint/pprint (macroexpand '(time (print "timing")))) (let* [start__3917__auto__ (. java.lang.System (clojure.core/nanoTime)) ret__3918__auto__ (print "timing")] (clojure.core/prn (clojure.core/str "Elapsed time: " (clojure.core// (clojure.core/double (clojure.core/- (. java.lang.System (clojure.core/nanoTime)) start__3917__auto__)) 1000000.0) " msecs")) ret__3918__auto__) ;; Even after pretty printing you may benefit from some ;; manual cleanup. ;; Also worth noting that most of the time macroexpand-1 is ;; a better alternative to avoid over expanding down too ;; many levels.

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

(macroexpand '(-> c (+ 3) (* 2))) (* (+ c 3) 2)

See also

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

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