+1
2012年11月4日日曜日 7時27分24秒 UTC+9 CGAT:
>
> It would be nice if clojure.core/conj had a unary implementation
>
> ([coll] coll)
>
> The motivating use case is when one is conjoining sequences of
> items to a collection all at once:
>
> (apply conj coll seqable)
>
> such as (apply conj #{1 2 3} [2 4 6 8 10]).
> Currently (1.4.0), this will raise an arity exception
> if the seqable object is empty:
>
> (apply conj #{1 2 3} [])
>
> necessitating an awkward empty? check when,
> for instance, the sequence is computed or passed in.
>
> It seems to me that making unary conj the identity is both
> a natural interpretation and essentially cost free, while
> making this use case much more convenient.
> Moreover, it is consistent with clojure.core/disj for sets
> which does act like this
>
> (apply disj #{1 2 3} []) -> #{1 2 3}
>
> and has an identity unary implementation.
>
> Comments?
>
>
>
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