What is the difference between the evaluation of double and #'double in Clojure/Lisp?
1:2 user=> double
#<core$double__4077 clojure.core$double__4077@1acd47>
1:3 user=> #'double
#'clojure.core/double
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132answers:
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A:
In Clojure, #'foo is a shorthand for (var foo), which returns the variable object foo refers to, as opposed to its value. Look it up in the reference:
I am not sure if you also want to know the meaning in Lisp: In Common Lisp, #'foo is a shorthand for (function foo), which is used to access the function value bound to the name foo when not in operator position.
Svante
2009-07-22 09:43:06
slightly wrong. (function foo) looks up the functional value, true, but not necessarily from the symbol. A lexical function has no symbols involved, so it looks about the functional value bound to the name (!) foo from the lexical environment.
Rainer Joswig
2009-07-22 11:26:56
Right, fixed. I really should fix my tendency to say "symbol" when I mean "name".
Svante
2009-07-22 12:55:41