On Friday, May 25, 2018 at 7:40:12 AM UTC-5, Sonny To wrote:
>
> Hi James,
> I'm trying to access the local bindings of the closure like it is an object
> (.-x bar) should give 1. I can use a defrecord for this but I want to use
> regular functions and no macro magic
>
This isn't quite what you're asking for, but one approach to what records
actually do would be to return a map of closures that include accessors for
the state. (Disclaimer: I'm totally doing this off the top of my head in
the google groups web interface, without even checking that the parentheses
are balanced) One example would be:
(defn build-incrementer
[x]
{:inc (fn [] (inc x))
:dec (fn [] (dec x))
:status (fn [] x)})
Is that close to what you wanted?
Regards,
James
>
> On Friday, May 25, 2018 at 9:01:22 AM UTC+3, James Gatannah wrote:
>
>> On Thursday, May 24, 2018 at 1:22:42 PM UTC-5, Sonny To wrote:
>>>
>>> (defn foo[]
>>> (let [x 1]
>>> (fn []
>>> (+ x 1)
>>> )
>>> )
>>>
>>> (def bar (foo))
>>>
>>> Is there a way to get the value of x from closure bar?
>>>
>>
>> I may be describing this incorrectly.
>>
>> You're creating a top-level var named bar.
>>
>> You're calling the function foo, and associating the value it returns to
>> that var bar.
>>
>> foo's return value happens to be a function that looks like it should be
>> a counter. Except that, in clojure, it isn't.
>>
>> This vaguely looks like an approach to lexical closures that I vaguely
>> remember from scheme textbooks (and Paul Graham essays).
>>
>> What are you really trying to do?
>>
>
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