(->> [[{"a" [0 0]}] [{"b" [1 0]} {"c" [1 1]}]]
       (into {} cat))
=> {"a" [0 0], "b" [1 0], "c" [1 1]}

Evaluation count : 880242 in 6 samples of 146707 calls.
             Execution time mean : 700,956158 ns
    Execution time std-deviation : 19,278226 ns
   Execution time lower quantile : 681,019938 ns ( 2,5%)
   Execution time upper quantile : 719,853122 ns (97,5%)
                   Overhead used : 9,167308 ns

(->> [[{"a" [0 0]}] [{"b" [1 0]} {"c" [1 1]}]] (into {} cat))
=> {"a" [0 0], "b" [1 0], "c" [1 1]}

Evaluation count : 505554 in 6 samples of 84259 calls.
             Execution time mean : 1,256155 µs
    Execution time std-deviation : 98,489147 ns
   Execution time lower quantile : 1,177919 µs ( 2,5%)
   Execution time upper quantile : 1,420580 µs (97,5%)
                   Overhead used : 9,167308 ns

Found 1 outliers in 6 samples (16,6667 %)
  low-severe   1 (16,6667 %)
 Variance from outliers : 15,4899 % Variance is moderately inflated by outliers

(->> [[{"a" [0 0]}] [{"b" [1 0]} {"c" [1 1]}]] (apply concat) (apply merge))
=> {"a" [0 0], "b" [1 0], "c" [1 1]}

(into {} (flatten [[{"a" [0 0]}] [{"b" [1 0]} {"c" [1 1]}]]))

(flatten [[["a" [0 0]]] [["b" [1 0]] ["c" [1 1]]]])

(->> [[{"a" [0 0]}] [{"b" [1 0]} {"c" [1 1]}]]
     (reduce into {}))