>
> - 'you always get back a value of the concrete type you supplied for
> argument X' isn't obviously less cognitively burdensome than 'you always
> get back a sequence'
>
Combining objects of type X should give a result that is of type X. That
seems the most natural to me.
> - doesn't Python, in all its teachability, just throw a TypeError if you
> try and concatenate differently typed collections, even in trivial cases
> (e.g. (1,) + [2])? Is there a way to do that in Python which doesn't
> involve writing a concat function w/ a bunch of type checks
>
Whether to allow vectors and lists to combine is something that can be
discussed. Seems like may be a good idea and an improvement over Python.
> - runtime list construction in Clojure is comparatively rare. I'm not a
> teacher, but in a practical educational setting I would focus on vectors as
> the general-purpose ordered collection type - esp. if i were interested in
> appending to them.
>
I like below. It also takes over the str command. Basically a single
function to do all basic combinations. Notice whether run time list
construction is a good idea or not does not
have to be decided by me. I just make the ability available.
(defn comb [& args]
(let [comb_ (apply concat args)]
(cond (string? (first args)) (apply str comb_)
(vector? (first args)) (into [] comb_)
(list? (first args)) comb_)))
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