If you want to keep this style, why not use a simple map of function
instead of reifying a protocol? Something like:
(defn calc-multiply [data] ...)
(defn calc-add [data] ...)
(defn make-calc [] {:calc-add #'calc-add, :calc-multiply #'calc-multiply})
Looks simpler and cleaner for me.
On Wed, Jun 5, 2013 at 12:16 PM, john <john.vie...@gmail.com> wrote:
> Hi,
> I recently wrote some code for which I have 2 alternative implementations.
> So what I did is write a protocol:
>
> (defprotocol Calculator
> (calc-add [this data])
> (calc-multiply [this data]))
>
>
> I then created two namespaces for my two implementations:
> which each had a function:
>
> (defn make-calculator []
> (reify Calculator
> (calc-add [this data] .....)
> (calc-multiply [this data]....))
>
> So my core code was using this protocol and I can switch implementation by
> just handing my "protocol-using-code" a different make-calculator.
>
> But am I really doing programming in a functional style?
>
> I mean I am creating with reify a class only so that my different
> implementation gets called.
> This "reify" makes me think "this is not functional but more OO like".
>
> On the other hand it is very nice to have a "grouping of certain functions"
> and it makes it clear this protocol
> is a plugin point for custom implementations.
>
> I don't know?! Am I just complaining about perfect readable side effect free
> code?
>
> Many Greetings
> John
>
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