Way back when I was a wee lad I had been taught that a thunk is any
function that takes no arguments. My definition for my derived values
never took any arguments because they exclusively relied on global
variables.
For example:
(defn months_actively_renting
"The number of months during the time we are in the rental business
that we are either trying to rent the house out or have rented it out"
[]
(* (+ *Months_To_Find_Tenant* *Months_In_Lease*) *Lease_Cycles*))
That's all I meant by the term thunk.
On Feb 17, 10:20 pm, Richard Newman <holyg...@gmail.com> wrote:
> > I'm just trying to figure out what the right pattern is
> > because the fact that I'm forced to make the derived values into
> > thunks feels really wrong but I honestly don't know what's right in
> > the context of Clojure.
>
> I don't think you're using the term "thunk" correctly.
>
> A thunk is (usually) a no-argument function, typically used for things
> like delayed evaluation, and typically capturing some environment. E.g.,
>
> (defn hello [thunk]
> (println "Hello, " (thunk)))
>
> (defn make-name-thunk [name]
> (fn [] name))
>
> (let [n (make-name-thunk "Jim")]
> (println "Calling hello...")
> (hello n))
>
> You are not making your derived values into thunks by this definition.
> Your derived values are just that: values, computed by functions.
> Compute them when you need them by invoking the appropriate functions
> with the appropriate arguments.
>
> Can you explain what you mean by "thunk"?
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