In Clojure - How do I access keys in a vector of structs
- by Nick
I have the following vector of structs:
(defstruct #^{:doc "Basic structure for book information."}
book :title :authors :price)
(def #^{:doc "The top ten Amazon best sellers on 16 Mar 2010."}
best-sellers
[(struct book
"The Big Short"
["Michael Lewis"]
15.09)
(struct book
"The Help"
["Kathryn Stockett"]
9.50)
(struct book
"Change Your Prain, Change Your Body"
["Daniel G. Amen M.D."]
14.29)
(struct book
"Food Rules"
["Michael Pollan"]
5.00)
(struct book
"Courage and Consequence"
["Karl Rove"]
16.50)
(struct book
"A Patriot's History of the United States"
["Larry Schweikart","Michael Allen"]
12.00)
(struct book
"The 48 Laws of Power"
["Robert Greene"]
11.00)
(struct book
"The Five Thousand Year Leap"
["W. Cleon Skousen","James Michael Pratt","Carlos L Packard","Evan Frederickson"]
10.97)
(struct book
"Chelsea Chelsea Bang Bang"
["Chelsea Handler"]
14.03)
(struct book
"The Kind Diet"
["Alicia Silverstone","Neal D. Barnard M.D."]
16.00)])
I would like to sum the prices of all the books in the vector. What I have is the following:
(defn get-price
"Same as print-book but handling multiple authors on a single book"
[ {:keys [title authors price]} ]
price)
Then I:
(reduce + (map get-price best-sellers))
Is there a way of doing this without mapping the "get-price" function over the vector? Or is there an idiomatic way of approaching this problem?
