Clojure - extract values from a vector of hashmaps

(map #(get % "key1") myvec) should be all you need.

(let [v [{"key1" "value1", "key2" "value2"} {"key1" "value3", "key2" "value4"}]]
  (vec (map #(% "key1") v)))

If you use keywords for your keys:

(let [v [{:key1 "value1", :key2 "value2"} {:key1 "value3", :key2 "value4"}]]
  (vec (map :key1 v)))

If you don't want to include nil values when the maps don't have the given key:

(let [v [{:key1 "value1", :key2 "value2"} {:key1 "value3", :key2 "value4"} {:key2 "value5"}]]
  (vec (keep :key1 v)))

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