I wanted to take a Map and convert it to a string suitable for use as
parameters in a URL. I have got it working below two different ways
but wondered if there was a better or more idiomatic way to do this.
;; My test input map
(def input {:a 1 :b 2 :c 3 :d 4})
;; What I'd like the input map convert into. A string that looks like
keyword=value&keyword=value&, ....
(def output "a=1&b=2&c=3&d=4")
;; This function converts each MapEntry to the key=value
(defn map-entry-to-string-pair
"Convert a key value from a map into a string that looks like
key=value.
For example,
(def input {:a 1 :b 2 :c 3 :d 4})
(map-entry-to-string-pair (first input)) => \"a=1\""
[mapentry]
(str (name (first mapentry)) "=" (second mapentry)))
;; The following two functions build the result string. There is not
much of a difference between them. The first uses
;; let to hold a variable after mapping map-entry-to-string-pair over
the input map. The other just uses the same mapping
;; after converting it to a vector.
(defn convert-map-to-url-string1
"Convert a map from keyword values to a string that consists of
keyword=value pairs separated by &s for use in a URL
For example,
(def input {:a 1 :b 2 :c 3 :d 4})
(convert-map-to-url-string1 input) => \"a=1&b=2&c=3&d=4\""
[m]
(let [pairs (map map-entry-to-string-pair m)]
(join "&" pairs)))
(defn convert-map-to-url-string2
"Convert a map from keyword values to a string that consists of
keyword=value pairs separated by &s for use in a URL
For example,
(def input {:a 1 :b 2 :c 3 :d 4})
(convert-map-to-url-string2 input) => \"a=1&b=2&c=3&d=4\""
[m]
(join "&" (vec (map map-entry-to-string-pair m))))
Is there a simpler, better way to do this?
- Brad
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