Hi,
On 2 Nov., 07:41, Meikel Brandmeyer <m...@kotka.de> wrote:
> Hi,
>
> On 2 Nov., 03:25, Mike K <mbk.li...@gmail.com> wrote:
> The map destructuring in the defn is a special case of defn, not
> destructuring itself.
>
> (defn foo [& {:keys [a b]}] ...)
>
> is equivalent to
>
> (defn foo [& options#] (let [{:keys [a b]} (apply hash-map
> options#)] ...))
Scratch that. I'm wrong. It really is a feature of destructuring
itself. The issue is: a vector is not a seq.
user=> (let [{a :a} [:b 7 :a 3]] [a])
[nil]
user=> (let [{a 2} [:b 7 :a 3]] [a])
[:a]
user=> (let [{a :a} (seq [:b 7 :a 3])] [a])
[3]
And that also works for your example, which I completely misread.
user=> (defn foo [{:keys [a b]}] [a])
#'user/foo
user=> (foo [:b 7 :a 5])
[nil]
user=> (foo (seq [:b 7 :a 5]))
[5]
Sorry for the noise.
Take aways: 1) Don't write emails before first coffee. And 2)
datastructures and seqs are different things.
Sincerely
Meikel
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