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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