Clojure: adding to a map

Question

If I have a vector of maps

(def v [{:key1 "value 1" :key2 "value2"} {:key1 "value 3" :key2 "value4"}])

and a map

(def m {:key3 "value2" :key4 "value5"})

How to add map m to all the maps in vector v where the values of 2 given keys (in this case key2 and key3) are equal?

The expected result would be this:

[{:key1 "value 1" :key2 "value2" :key3 "value2" :key4 "value5"} {:key1 "value 3" :key2 "value4"}]

Diego Basch · Accepted Answer · 2014-10-21 22:39:01Z

3

You want to merge each map with m3 if key2 and k3 are equal:

(map (fn [x] (if (= (:key2 x) (:key3 m)) (merge m x) x)) v)

=>

({:key3 "value2", :key2 "value2", :key4 "value5", :key1 "value 1"} {:key2 "value4", :key1 "value 3"})

answered Oct 21, 2014 at 22:39

Diego Basch

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2 Comments

Diego Basch Over a year ago

Yeah, mapv if the result needs to be a vector.

Vesna Over a year ago

I have one more question, I have a situation like this,vector is (defn v2 []( map #(zipmap (create-keys ["url" "title"]) %) (func-contents ["url" "title"] "//event" data-url))) data-url is in this question bit.ly/1x83gYH and map is (defn v1[] (map #(zipmap (create-keys ["name" "url"]) %) (func-contents ["name" "url"] "//artist" "ws.audioscrobbler.com/2.0/…))). In this case it doesn't work, it adds the map anyway.

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