On Saturday, November 2, 2013 4:56:13 PM UTC-5, Jozef Wagner wrote:
>
> Problem is, when your proposed dissoc removes value from a vector, it
> shifts all larger keys. So dissoc would not only remove value at index
> position, but also change keys for pther values. And this is not what
> dissoc should do
>
You're right. I'm not sure why this is suddenly clear without essentially
any new information. :) I think I had the wrong conceptual impression of
what assoc and dissoc should be, putting the emphasis on the generality of
the collection types instead its specificity to the indicies.
For my notion of assoc/dissoc to hold parity, it would have to work like
this which seems undesirable:
(def some-vector ['a 'b 'c 'd 'e])
(def some-map {0 'a 1 'b 2 'c 3 'd 4 'e})
(assoc some-vector 2 'x)
;=> [a b x d e]
(dissoc some-vector 2) ;; theoretical
;=> [a b d e] ;; theoretical
(assoc some-map 2 'x)
;=> {0 a, 1 b, 2 x, 3 d, 4 e}
(dissoc some-map 2)
;=> {0 a, 1 b, 2 d, 3 e} ;; not good
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