LOL @ COUNT

gistfile1.clj

user> (def s (apply str (repeat 100 "a")))
#'user/s
user> (bench/quick-bench (count s))
WARNING: Final GC required 2082.410405844158 % of runtime
Evaluation count : 8685690 in 6 samples of 1447615 calls.
             Execution time mean : 67.822779 ns
    Execution time std-deviation : 1.770044 ns
   Execution time lower quantile : 65.381948 ns ( 2.5%)
   Execution time upper quantile : 69.642259 ns (97.5%)
                   Overhead used : 2.812543 ns
nil
user> 
user> (defn len [^String s] (.length s))
#'user/len
user> (bench/quick-bench (len s))
WARNING: Final GC required 1542.204593526074 % of runtime
Evaluation count : 45887352 in 6 samples of 7647892 calls.
             Execution time mean : 11.174775 ns
    Execution time std-deviation : 0.501435 ns
   Execution time lower quantile : 10.569196 ns ( 2.5%)
   Execution time upper quantile : 11.769903 ns (97.5%)
                   Overhead used : 2.812543 ns
nil