问题
Does anybody know if there is a Clojure equivalent for Pythons "dir". Basically I need to know the functions I can call on something or more specifically for java objects I want to know the methods and properties available (I am not sure if in java they are called methods and properties, this is C# lingo).
回答1:
clojure.contrib.repl-utils/show for use at the REPL:
user=> (use '[clojure.contrib.repl-utils :only (show)])
nil
user=> (show String)
=== public final java.lang.String ===
[ 0] static CASE_INSENSITIVE_ORDER : Comparator
[ 1] static copyValueOf : String (char[])
[ 2] static copyValueOf : String (char[],int,int)
[ 3] static format : String (Locale,String,Object[])
[ 4] static format : String (String,Object[])
...
Alternatively, maybe something like:
user=> (map #(.getName %) (.getMethods String))
("equals" "toString" "hashCode" "compareTo" ...)
.getFields, and .getConstructors accordingly.
回答2:
The clojure.repl namespace (which is available since Clojure 1.2) contains the macro dir and the function dir-fn:
user=> (clojure.repl/dir clojure.main)
load-script
main
repl
...
user=> (clojure.repl/dir-fn 'clojure.main)
(load-script main repl repl-caught repl-exception
repl-prompt repl-read skip-if-eol skip-whitespace
with-bindings)
来源：https://stackoverflow.com/questions/4637615/python-dir-equivalent-in-clojure