On Sun, 05 Apr 2015, Michael Blume wrote:
> your list doesn't contain the records, your list contains the symbols 'a1
> and 'a2. You can't make a list the way you're trying to.
To be specific, you're quoting the list in your def, so the a1 and a2 symbols
are
not evaluated.
user=> (defrecord Ape [fname lname])
user.Ape
user=> (def a1 (->Ape "test1" "test2"))
#'user/a1
user=> (def a2 (->Ape "test3" "test4"))
#'user/a2
user=> '(a1 a2)
(a1 a2)
user=> (quote (a1 a2))
(a1 a2)
user=> (list a1 a2)
(#user.Ape{:fname "test1", :lname "test2"} #user.Ape{:fname "test3", :lname
"test4"})
user=> (def alist (list a1 a2))
#'user/alist
user=> (filter #(= "test1" (:fname %)) alist)
(#user.Ape{:fname "test1", :lname "test2"})
;; Clojure idioms tend toward vectors and vector literals rather than
;; lists. If you have a background in Common Lisp or Scheme, this can
;; take some getting used to. One nice consequence is you don't have
;; to worry about quoting most of the time.
user=> (filter #(= "test1" (:fname %)) [a1 a2])
(#user.Ape{:fname "test1", :lname "test2"})
Cheers,
Paul
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