(in [10 11 12 13] 0 42 ) # => 10 (in {:a 10 :b 20} :a 42 ) # => 10 (in [10 11 12] 99 42 ) # error (in [10 11 12] -1 42 ) # error (in [10 11 12] -2 42 ) # error (in {:a 1} :z 42 ) # => 42 (map (fn [x] (in x 0 42)) [ 'a :a "a" [97] @[97] {0 97} @{0 97} {:a 1} ]) # => @[ 97 97 97 97 97 97 97 42 ]