add Clojure and its dialects to /samples

samples/Clojure/for.clj

@@ -0,0 +1,17 @@
+(defn prime? [n]
+   (not-any? zero? (map #(rem n %) (range 2 n))))
+
+(range 3 33 2)
+'(3 5 7 9 11 13 15 17 19 21 23 25 27 29 31)
+
+;; :when continues through the collection even if some have the
+;; condition evaluate to false, like filter
+(for [x (range 3 33 2) :when (prime? x)]
+   x)
+'(3 5 7 11 13 17 19 23 29 31)
+
+;; :while stops at the first collection element that evaluates to
+;; false, like take-while
+(for [x (range 3 33 2) :while (prime? x)]
+   x)
+'(3 5 7)

samples/Clojure/hiccup.hic

@@ -0,0 +1,8 @@
+[:html
+ [:head
+  [:meta {:charset "utf-8"}]
+  [:link {:rel "stylesheet" :href "css/bootstrap.min.css"}]
+  [:script {:src "app.js"}]]
+ [:body
+  [:div.nav
+   [:p "Hello world!"]]]]

samples/Clojure/into-array.cljc

@@ -0,0 +1,13 @@
+(defn into-array
+  ([aseq]
+     (into-array nil aseq))
+  ([type aseq]
+     (let [n (count aseq)
+           a (make-array n)]
+       (loop [aseq (seq aseq)
+              i 0]
+         (if (< i n)
+           (do
+             (aset a i (first aseq))
+             (recur (next aseq) (inc i)))
+           a)))))

samples/Clojure/protocol.cljs

@@ -0,0 +1,15 @@
+(defprotocol ISound (sound []))
+ 
+(deftype Cat []
+  ISound
+  (sound [_] "Meow!"))
+ 
+(deftype Dog []
+  ISound
+  (sound [_] "Woof!"))
+ 
+(extend-type default
+  ISound
+  (sound [_] "... silence ..."))
+ 
+(sound 1) ;; => "... silence ..."

samples/Clojure/rand.cljscm

@@ -0,0 +1,5 @@
+(defn rand
+  "Returns a random floating point number between 0 (inclusive) and
+  n (default 1) (exclusive)."
+  ([] (scm* [n] (random-real)))
+  ([n] (* (rand) n)))

samples/Clojure/svg.cljx

@@ -0,0 +1,20 @@
+^:clj (ns c2.svg
+        (:use [c2.core :only [unify]]
+              [c2.maths :only [Pi Tau radians-per-degree
+                               sin cos mean]]))
+
+^:cljs (ns c2.svg
+         (:use [c2.core :only [unify]]
+               [c2.maths :only [Pi Tau radians-per-degree
+                                sin cos mean]])
+         (:require [c2.dom :as dom]))
+
+;;Stub for float fn, which does not exist on cljs runtime
+^:cljs (def float identity)
+
+(defn ->xy
+  "Convert coordinates (potentially map of `{:x :y}`) to 2-vector."
+  [coordinates]
+  (cond
+   (and (vector? coordinates) (= 2 (count coordinates))) coordinates
+   (map? coordinates) [(:x coordinates) (:y coordinates)]))

samples/Clojure/unit-test.cl2

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+(deftest function-tests
+  (is (= 3
+         (count [1 2 3])))
+  (is (= false
+         (not true)))
+  (is (= true
+         (contains? {:foo 1 :bar 2} :foo)))
+
+  (is (= {"foo" 1, "baz" 3}
+         (select-keys {:foo 1 :bar 2 :baz 3} [:foo :baz])))
+
+  (is (= [1 2 3]
+         (vals {:foo 1 :bar 2 :baz 3})))
+
+  (is (= ["foo" "bar" "baz"]
+         (keys {:foo 1 :bar 2 :baz 3})))
+
+  (is (= [2 4 6]
+         (filter (fn [x] (=== (rem x 2) 0)) [1 2 3 4 5 6]))))
+