Convert string representation of list to list in clojure

Question

If I have

(def a "((a,"a1",0.533,0.122,0.608,0.258) 
         (c,"c1",0.863,0.031,0.998,0.667) 
         (b,"b1",0.53,0.117,0.609,0.256))")

I would like to have

(def b '((a,"a1",0.533,0.122,0.608,0.258) 
         (c,"c1",0.863,0.031,0.998,0.667) 
         (b,"b1",0.53,0.117,0.609,0.256)))

where I can access each element in b with

(first b) ; which should return (a,"a1",0.533,0.122,0.608,0.258)

and

(type (first (first b)) ; returns clojure.lang.Symbol
(type (second (first b)) ; returns java.lang.String
(type (last (first b)) ; returns java.lang.Double

I tried just putting (symbol a) but that seems to turn the entire string into a single symbol.

leetwinski · Accepted Answer · 2020-05-21 11:00:47Z

3

what you need is clojure.edn/read-string:

user> (clojure.edn/read-string
       "((a,\"a1\",0.533,0.122,0.608,0.258) (c,\"c1\",0.863,0.031,0.998,0.667)(b,\"b1\",0.53,0.117,0.609,0.256))")

;;=> ((a "a1" 0.533 0.122 0.608 0.258)
;;    (c "c1" 0.863 0.031 0.998 0.667)
;;    (b "b1" 0.53 0.117 0.609 0.256))

user> (def b (clojure.edn/read-string
               "((a,\"a1\",0.533,0.122,0.608,0.258) (c,\"c1\",0.863,0.031,0.998,0.667) (b,\"b1\",0.53,0.117,0.609,0.256))"))
#'user/b

user> (first b)
;;=> (a "a1" 0.533 0.122 0.608 0.258)

user> (type (first (first b)))
;;=> clojure.lang.Symbol

user> (type (last (first b)))
;;=> java.lang.Double

user> (type (second (first b)))
;;=> java.lang.String

edited May 21, 2020 at 11:00

answered May 21, 2020 at 10:35

leetwinski

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1 Comment

user3710760 Over a year ago

Thanks, that's exactly what I needed!

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