Merge pull request #8149 from tylerw/tw/challenge-218

Ch218: implement Task 1 in Clojure

6 files changed, 57 insertions, 5 deletions

diff --git a/challenge-218/tyler-wardhaugh/clojure/README.md b/challenge-218/tyler-wardhaugh/clojure/README.md
index edcc7f57c7..130e9d2771 100644
--- a/challenge-218/tyler-wardhaugh/clojure/README.md
+++ b/challenge-218/tyler-wardhaugh/clojure/README.md
@@ -1,6 +1,6 @@
-# c217
+# c218
 
-The Weekly Challenge — #217 — Tyler Wardhaugh
+The Weekly Challenge — #218 — Tyler Wardhaugh
 
 ## Usage
 
diff --git a/challenge-218/tyler-wardhaugh/clojure/bb.edn b/challenge-218/tyler-wardhaugh/clojure/bb.edn
index e9f441cb63..fb73b927b3 100644
--- a/challenge-218/tyler-wardhaugh/clojure/bb.edn
+++ b/challenge-218/tyler-wardhaugh/clojure/bb.edn
@@ -1,6 +1,6 @@
 {
  :paths ["src" "resources"]
- :deps {c217/c217 {:local/root "."}}
+ :deps {c218/c218 {:local/root "."}}
 
  :tasks
  {
diff --git a/challenge-218/tyler-wardhaugh/clojure/build.clj b/challenge-218/tyler-wardhaugh/clojure/build.clj
new file mode 100644
index 0000000000..29381cb7c3
--- /dev/null
+++ b/challenge-218/tyler-wardhaugh/clojure/build.clj
@@ -0,0 +1,19 @@
+(ns build
+  (:refer-clojure :exclude [test])
+  (:require [org.corfield.build :as bb]))
+
+(def lib 'net.clojars.c218/c218)
+(def version "0.1.0-SNAPSHOT")
+(def main 'c218.c218)
+
+(defn test "Run the tests." [opts]
+  (bb/run-tests opts))
+
+(def clean bb/clean)
+
+(defn ci "Run the CI pipeline of tests (and build the uberjar)." [opts]
+  (-> opts
+      (assoc :lib lib :version version :main main)
+      (bb/run-tests)
+      (bb/clean)
+      (bb/uber)))
diff --git a/challenge-218/tyler-wardhaugh/clojure/deps.edn b/challenge-218/tyler-wardhaugh/clojure/deps.edn
index 9c7a50a024..3d77f22cca 100644
--- a/challenge-218/tyler-wardhaugh/clojure/deps.edn
+++ b/challenge-218/tyler-wardhaugh/clojure/deps.edn
@@ -1,8 +1,8 @@
 {:paths ["src" "resources"]
  :deps {org.clojure/clojure {:mvn/version "1.11.1"}}
  :aliases
- {:t1 {:main-opts ["-m" "c217.t1"]}
-  :t2 {:main-opts ["-m" "c217.t2"]}
+ {:t1 {:main-opts ["-m" "c218.t1"]}
+  :t2 {:main-opts ["-m" "c218.t2"]}
   :build {:deps {io.github.seancorfield/build-clj
                  {:git/tag "v0.8.3" :git/sha "7ac1f8d"
                   ;; since we're building an app uberjar, we do not
diff --git a/challenge-218/tyler-wardhaugh/clojure/src/c218/t1.clj b/challenge-218/tyler-wardhaugh/clojure/src/c218/t1.clj
new file mode 100644
index 0000000000..2f466fe133
--- /dev/null
+++ b/challenge-218/tyler-wardhaugh/clojure/src/c218/t1.clj
@@ -0,0 +1,23 @@
+(ns c218.t1
+  (:require
+    [clojure.edn :as edn]))
+
+(def DEFAULT-INPUT [[3 1 2]])
+
+(defn max-product
+  [coll]
+  (let [sorted (->> coll sort (into []))
+        len (count sorted)
+        three-largest (subvec sorted (- len 3))
+        two-smallest-and-largest (concat (subvec sorted 0 2) [(peek sorted)])]
+    (tap> [sorted three-largest two-smallest-and-largest])
+    (->> [three-largest two-smallest-and-largest]
+         (map #(reduce * 1 %))
+         (apply max))))
+
+(defn -main
+  "Run Task 1 with a given input COLL, defaulting to the first example from the
+  task description."
+  [& args]
+  (let [[coll] (or (some->> args (map edn/read-string)) DEFAULT-INPUT)]
+    (println (max-product coll))))
diff --git a/challenge-218/tyler-wardhaugh/clojure/test/c218/t1_test.clj b/challenge-218/tyler-wardhaugh/clojure/test/c218/t1_test.clj
new file mode 100644
index 0000000000..4350e5abd5
--- /dev/null
+++ b/challenge-218/tyler-wardhaugh/clojure/test/c218/t1_test.clj
@@ -0,0 +1,10 @@
+(ns c218.t1-test
+  (:require [clojure.test :refer [deftest is testing]]
+            [c218.t1 :refer [max-product]]))
+
+(deftest task-1
+  (testing "Task 1 produces the correct results from examples in the description"
+    (is (= 6 (max-product [3 1 2])))
+    (is (= 24 (max-product [4 1 3 2])))
+    (is (= 3 (max-product [-1 0 1 3 1])))
+    (is (= 216 (max-product [-8 2 -9 -4 3])))))