I must re-read "Clojure Programming" (O'Reilly) in that case as I don't
recall the authors mentioning this kind of destructuring.
gvim
On 06/06/2015 03:33, Fluid Dynamics wrote:
On Friday, June 5, 2015 at 10:07:05 PM UTC-4, g vim wrote:
That works but I missed this possibility because I'm still not clear
how:
(group-by :email signs)
.... which produces a map of the form:
{"a...@gmail.com <javascript:>"
[{:email "a...@gmail.com <javascript:>", :sign "Cancer",
:planet "Mars", :surname
"Blogs", :first_name "Joe"}
..... ]}
.... can be destructured with the vector [email signs]. I assumed a map
must be destructured with a map but couldn't find a solution as the map
keys are unique values, ie. email addresses.
The code was (for [[email signs] (group-by...)]...). The for iterates
over the map produced by group-by, producing individual map entries, and
map entries can be treated as two-element seqs/vectors of [key value],
which is what the destructuring does here, putting the key in local
binding email and the value, a vector with maps in it, in signs.
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