user> (def foo (transient [1 2 3]))
#'user/foo
user> (get foo 0)
1
user> (count foo)
3
user> (nth foo 0)
1
user> (def bar (transient {:honda 7 :kagawa 23 :ienaga 14}))
#'user/bar
user> (get bar :kagawa)
23
user> (count bar)
3

;; There is a known bug in Clojure 1.3 where contains? always returns false for
;; transients.  http://dev.clojure.org/jira/browse/CLJ-700
;; contains? works fine for persistent data structures.
user> (contains? bar :kagawa)  ; Caution! 
false
user> (def bar2 (persistent! bar))
#'user/bar2
user> (contains? bar2 :kagawa) ; Caution!
true

user> (def foo (transient [1 2 3]))
#'user/foo
user> (get foo 0)
1
user> (count foo)
3
user> (nth foo 0)
1
user> (def bar (transient {:honda 7 :kagawa 23 :ienaga 14}))
#'user/bar
user> (get bar :kagawa)
23
user> (count bar)
3
user> (contains? bar :kagawa)  ; Caution! 
false
user> (def bar2 (persistent! bar))
#'user/bar2
user> (contains? bar2 :kagawa) ; Caution!
true

user> (def foo (transient [1 2 3]))
#'user/foo
user> (get foo 0)
1
user> (count foo)
3
user> (nth foo 0)
1
user> (def bar (transient {:honda 18 :kagawa 23 :ienaga 14}))
#'user/bar
user> (get bar :kagawa)
23
user> (count bar)
3
user> (contains? bar :kagawa)  ; Caution! 
false
user> (def bar2 (persistent! bar))
#'user/bar2
user> (contains? bar2 :kagawa) ; Caution!
true

user> (def foo (transient [1 2 3]))
#'user/foo
user> (get foo 0)
1
user> (count foo)
3
user> (nth foo 0)
1
user> (def bar (transient {:honda 18 :kagawa 23 :ienaga 10}))
#'user/bar
user> (get bar :kagawa)
23
user> (count bar)
3
user> (contains? bar :kagawa)  ; Caution! 
false
user> (def bar2 (persistent! bar))
#'user/bar2
user> (contains? bar2 :kagawa) ; Caution!
true