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Task/Comma-quibbling/Clojure/comma-quibbling.clj

@@ -0,0 +1,18 @@
+(defn quibble [sq]
+  (let [sep (if (pos? (count sq)) " and " "")]
+    (apply str
+      (concat "{" (interpose ", " (butlast sq)) [sep (last sq)] "}"))))
+
+; Or, using clojure.pprint's cl-format, which implements common lisp's format:
+(defn quibble-f [& args]
+  (clojure.pprint/cl-format nil "{~{~a~#[~; and ~:;, ~]~}}" args))
+
+(def test
+  #(doseq [sq [[]
+               ["ABC"]
+               ["ABC", "DEF"]
+               ["ABC", "DEF", "G", "H"]]]
+     ((comp println %) sq)))
+
+(test quibble)
+(test quibble-f)