Ch198: Implement Tasks 1 & 2 in Clojure

8 files changed, 82 insertions, 5 deletions

diff --git a/challenge-198/tyler-wardhaugh/clojure/README.md b/challenge-198/tyler-wardhaugh/clojure/README.md
index 478f7395fd..c89eb6b103 100644
--- a/challenge-198/tyler-wardhaugh/clojure/README.md
+++ b/challenge-198/tyler-wardhaugh/clojure/README.md
@@ -1,6 +1,6 @@
-# c197
+# c198
 
-The Weekly Challenge — #197 — Tyler Wardhaugh
+The Weekly Challenge — #198 — Tyler Wardhaugh
 
 ## Usage
 
diff --git a/challenge-198/tyler-wardhaugh/clojure/bb.edn b/challenge-198/tyler-wardhaugh/clojure/bb.edn
index f02268dce7..5709814635 100644
--- a/challenge-198/tyler-wardhaugh/clojure/bb.edn
+++ b/challenge-198/tyler-wardhaugh/clojure/bb.edn
@@ -1,6 +1,6 @@
 {
  :paths ["src" "resources"]
- :deps {c197/c197 {:local/root "."}}
+ :deps {c198/c198 {:local/root "."}}
 
  :tasks
  {
diff --git a/challenge-198/tyler-wardhaugh/clojure/build.clj b/challenge-198/tyler-wardhaugh/clojure/build.clj
new file mode 100644
index 0000000000..b576dba656
--- /dev/null
+++ b/challenge-198/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.c198/c198)
+(def version "0.1.0-SNAPSHOT")
+(def main 'c198.c198)
+
+(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-198/tyler-wardhaugh/clojure/deps.edn b/challenge-198/tyler-wardhaugh/clojure/deps.edn
index a4f57caf90..7ccdfdb16c 100644
--- a/challenge-198/tyler-wardhaugh/clojure/deps.edn
+++ b/challenge-198/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" "c197.t1"]}
-  :t2 {:main-opts ["-m" "c197.t2"]}
+ {:t1 {:main-opts ["-m" "c198.t1"]}
+  :t2 {:main-opts ["-m" "c198.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-198/tyler-wardhaugh/clojure/src/c198/t1.clj b/challenge-198/tyler-wardhaugh/clojure/src/c198/t1.clj
new file mode 100644
index 0000000000..7e9ca6a80c
--- /dev/null
+++ b/challenge-198/tyler-wardhaugh/clojure/src/c198/t1.clj
@@ -0,0 +1,21 @@
+(ns c198.t1
+  (:require
+    [clojure.edn :as edn]))
+
+(def DEFAULT-INPUT [[2 5 8 1]])
+
+(defn max-gap
+  [coll]
+  (if (< (count coll) 2)
+    0
+    (let [pairs (->> coll sort (partition 2 1))
+          grouped (group-by (fn [[a b]] (- b a)) pairs)
+          max-key (apply max (keys grouped))]
+      (-> grouped (get max-key []) count))))
+
+(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-gap coll))))
diff --git a/challenge-198/tyler-wardhaugh/clojure/src/c198/t2.clj b/challenge-198/tyler-wardhaugh/clojure/src/c198/t2.clj
new file mode 100644
index 0000000000..603db7adc9
--- /dev/null
+++ b/challenge-198/tyler-wardhaugh/clojure/src/c198/t2.clj
@@ -0,0 +1,17 @@
+(ns c198.t2)
+
+(def DEFAULT-INPUT [10])
+(def CERTAINTY 1000)
+
+(defn prime-count
+  [n]
+  (let [f (fn [x]
+            (when (.isProbablePrime (BigInteger/valueOf x) CERTAINTY) 1))]
+    (transduce (keep f) + 0 (range n))))
+
+(defn -main
+  "Run Task 2 with a given input COLL, defaulting to the first example from
+  the task description."
+  [& args]
+  (let [[n] (or (some->> args (map parse-long)) DEFAULT-INPUT)]
+    (println (prime-count n))))
diff --git a/challenge-198/tyler-wardhaugh/clojure/test/c198/t1_test.clj b/challenge-198/tyler-wardhaugh/clojure/test/c198/t1_test.clj
new file mode 100644
index 0000000000..d8c6317530
--- /dev/null
+++ b/challenge-198/tyler-wardhaugh/clojure/test/c198/t1_test.clj
@@ -0,0 +1,10 @@
+(ns c198.t1-test
+  (:require [clojure.test :refer [deftest is testing]]
+            [c198.t1 :refer [max-gap]]))
+
+(deftest task-1
+  (testing "Task 1 produces the correct results from examples in the description"
+    (is (= 2 (max-gap [2 5 8 1])))
+    (is (zero? (max-gap [3]))))
+  (testing "Task 1 is correct for additional inputs"
+    (is (zero? (max-gap [])))))
diff --git a/challenge-198/tyler-wardhaugh/clojure/test/c198/t2_test.clj b/challenge-198/tyler-wardhaugh/clojure/test/c198/t2_test.clj
new file mode 100644
index 0000000000..76409fb485
--- /dev/null
+++ b/challenge-198/tyler-wardhaugh/clojure/test/c198/t2_test.clj
@@ -0,0 +1,10 @@
+(ns c198.t2-test
+  (:require [clojure.test :refer [deftest is testing]]
+            [c198.t2 :refer [prime-count]]))
+
+(deftest task-2
+  (testing "Task 2 produces the correct results from examples in the description"
+    (is (= 4 (prime-count 10)))
+    (is (= 6 (prime-count 15)))
+    (is (= 0 (prime-count 1)))
+    (is (= 9 (prime-count 25)))))