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Add variation of ring-codec assoc-conj #87

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Add variation of ring-codec assoc-conj #87

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13 changes: 13 additions & 0 deletions src/medley/core.cljc
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,19 @@
(defn- assoc-some-transient! [m k v]
(if (nil? v) m (assoc! m k v)))

(defn assoc-conj
"Associate a key with a non-nil value in a map. If the key already exists
in the map, a vector of values is associated with the key."
[map key val]
(if (nil? val)
map
(assoc map key
(if-let [cur (get map key)]
(if (vector? cur)
(conj cur val)
[cur val])
val))))

(defn assoc-some
"Associates a key k, with a value v in a map m, if and only if v is not nil."
([m k v]
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7 changes: 7 additions & 0 deletions test/medley/core_test.cljc
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,13 @@
(is (= (m/dissoc-in {:a 1} [])
{:a 1})))

(deftest test-assoc-conj
(is (= (m/assoc-conj nil :a 1) {:a 1}))
(is (= (m/assoc-conj nil :a nil) nil))
(is (= (m/assoc-conj {:a nil} :a 1) {:a 1}))
(is (= (m/assoc-conj {:a 1} :a 2) {:a [1 2]}))
(is (= (m/assoc-conj {:a 1} :a nil) {:a 1})))

(deftest test-assoc-some
(is (= (m/assoc-some {:a 1} :b 2) {:a 1 :b 2}))
(is (= (m/assoc-some {:a 1} :b nil) {:a 1}))
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