Ah I think I get it. 'x is a symbol pointing to a var which is a box that
contains some value (i.e. which could be a function)
i.e. the following def creates a var, puts 1 into it, then creates a symbol
'x and finally adds it to the user namespace :
user=> (def x 1)
#'user/x
we can see it in the namespace :
user=> ((ns-map *ns*) 'x)
#'user/x
user=> ('x (ns-map *ns*))
#'user/x
we can resolve the symbol to a var and then get the value in the var :
user=> (-> 'x resolve var-get)
1
we can also do this :
user=> (-> x var var-get)
1
However, im a bit puzzled by the following code as var is meant to take a
symbol and in '(var x)', x is not quoted so since clojure is strict then x
it should be evaluated to a Long. Secondly why do I get an error involving
Cons? :
user=> (type x)
java.lang.Long
user=> (type (var x))
clojure.lang.Var
user=> (var x)
#'user/x
user=> (type 'x)
clojure.lang.Symbol
user=> (var 'x)
CompilerException java.lang.ClassCastException: clojure.lang.Cons cannot be
cast to clojure.lang.Symbol,
compiling:(/tmp/form-init8428687381658026649.clj:1:1)
Andy
On Friday, 21 March 2014 23:46:33 UTC, John Mastro wrote:
>
> On Fri, Mar 21, 2014 at 4:44 PM, John Mastro <[email protected]<javascript:>
> > wrote:
>>
>> (let [f '(+ 1 1)]
>> (apply (resolve (first f) (rest f))))
>> ;=> 2
>>
>
> Sorry, I have a typo in there. It should be:
>
> (let [f '(+ 1 1)]
> (apply (resolve (first f)) (rest f)))
>
> --
> John Mastro
>
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