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I'm having some trouble understanding how map-of works. How would I use it to produce a map of keys to a vector of odd numbers?
(m/rewrite {:a [1 2 3]
:b [4 5 6]}
(m/map-of !ks ___)
(m/map-of !ks !vector-of-odds))map-of matches all entries with the key and value pattern respectively, for substitution it builds a map from the key and value patterns respectively.
(me/rewrite {:a [1 2 3]
:b [4 5 6]}
(me/map-of !ks (me/gather (me/pred odd? !odds)))
(me/map-of !ks !odds))
;; =>
{:a 1, :b 3}If you’re interested in mapping the keys to their respective odd numbers that would require a bit more effort.
(me/rewrite {:a [1 2 3]
:b [4 5 6]}
{?k (me/gather (me/pred odd? !odds)) & ?rest-map}
{?k [!odds ...] & (me/cata ?rest-map)}
?x
?x)
;; =>
{:b [5], :a [1 3]}Thanks, I was thinking about the second case
I see that map-of was the wrong direction to go