James Reeves <ja...@booleanknot.com> writes:
>> Which is nice and simple, yes. And has negative consequences in terms of
>> extensibility. I understand if you are happy with this compromise. But
>> it is a compromise.
>>
>
> I don't disagree, but I do consider the compromise to be a minor one.
>
> UAP has huge disadvantages in terms of complexity, repetition, scalability,
> reliability, isolation, and a whole bunch of other things that Clojure is
> explicitly trying to avoid.
>
> On the other hand, I can't personally recall a situation where it would
> have actually been useful to me.


Okay. I can give you a very concrete example, and one where I think that
it probably has been actually useful to you.


Imagine you write the following piece of code:

(first l)

This returns a value. If we obeyed the universal access principle,
however, we would not know whether this resulted from computational or
otherwise. And, in fact, Clojure does exactly this. It's why you can
write:

(take 10 (range))

The argument that Clojure prefers data over APIs is, as far as I can
see, just wrong. If that were the case, why not drop ISeq (which is an
API) and use a cons cell (which is data)? Answer, because hiding the
distinction between accessing data and performing computation allows you
to do some very useful things. Including infinitely long sequences. In
fact, that Clojure is built over abstractions (i.e an API) is a major
selling point.

The distinction of Clojure is not that it prefers data over APIs, but
that it prefers relatively few APIs, reused where possible.

Phil












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