Revision of short-name.clj

1 file changed, 19 insertions

short-name.clj(vytvořil soubor)

		@@ -0,0 +1,19 @@
1	+	(defn short-name-seq
2	+	"Lazy infinite seq of short names. like a,b,c..aa,bb,cc..zzzzz"
3	+	[]
4	+	(let [letters (map str "abcdefghijklmnopqrstuvwxyz")]
5	+	(mapcat (fn [length]
6	+	(map (fn [letter] (apply str (repeat length letter))) letters))
7	+	(range 1 Long/MAX_VALUE))))
8	+
9	+
10	+	; unit test
11	+
12	+	(deftest test-short-name-seq
13	+	(let [short-names (vec (take 1000 (short-name-seq)))]
14	+	(is (= (get short-names 0) "a"))
15	+	(is (= (get short-names 1) "b"))
16	+	(is (= (get short-names 25) "z"))
17	+	(is (= (get short-names 26) "aa"))
18	+	(is (= (get short-names 345) "hhhhhhhhhhhhhh"))
19	+	(is (= (get short-names 733) "fffffffffffffffffffffffffffff"))))

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