On 06/06/2015 05:01, Sean Corfield wrote:
Page 84 is where it shows that maps are a sequence of pairs.
The destructuring in James's code is on vectors -- the pairs in the
sequence.
Hope that helps?
Sean
Page 84 describes the sequence abstraction in general but it's the
implicit seq in for destructuring that threw me as I can't recall an
example of it in any books I've read. I don't know what to make of this,
for example:
(seq {:a "aa" :b "bb" :c "cc"})
([:c "cc"] [:b "bb"] [:a "aa"]) ;; Fine so far
(let [[x y z] (seq {:a "aa" :b "bb" :c "cc"})] [x y z])
[[:c "cc"] [:b "bb"] [:a "aa"]] ;; Consistent with first example above
(for [[x y z] {:a "aa" :b "bb" :c "cc"}] [x y z])
([:c "cc" nil] [:b "bb" nil] [:a "aa" nil]) ;; WTF?
Taken together these make no sense to me.
gvim
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