Add pangram exercise (#135)

config.json

@@ -585,6 +585,19 @@
         ],
         "difficulty": 2
       },
+      {
+        "slug": "pangram",
+        "name": "Pangram",
+        "uuid": "a646eaf6-3642-4d05-9083-b520699145b3",
+        "practices": [
+          "strings"
+        ],
+        "prerequisites": [
+          "strings",
+          "booleans"
+        ],
+        "difficulty": 2
+      },
       {
         "slug": "space-age",
         "name": "Space Age",

exercises/practice/pangram/.docs/instructions.md

@@ -0,0 +1,8 @@
+# Instructions
+
+Your task is to figure out if a sentence is a pangram.
+
+A pangram is a sentence using every letter of the alphabet at least once.
+It is case insensitive, so it doesn't matter if a letter is lower-case (e.g. `k`) or upper-case (e.g. `K`).
+
+For this exercise, a sentence is a pangram if it contains each of the 26 letters in the English alphabet.

exercises/practice/pangram/.docs/introduction.md

@@ -0,0 +1,16 @@
+# Introduction
+
+You work for a company that sells fonts through their website.
+They'd like to show a different sentence each time someone views a font on their website.
+To give a comprehensive sense of the font, the random sentences should use **all** the letters in the English alphabet.
+
+They're running a competition to get suggestions for sentences that they can use.
+You're in charge of checking the submissions to see if they are valid.
+
+~~~~exercism/note
+Pangram comes from Greek, παν γράμμα, pan gramma, which means "every letter".
+
+The best known English pangram is:
+
+> The quick brown fox jumps over the lazy dog.
+~~~~

exercises/practice/pangram/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "ErikSchierboom"
+  ],
+  "files": {
+    "solution": [
+      "src/pangram.cljs"
+    ],
+    "test": [
+      "test/pangram_test.cljs"
+    ],
+    "example": [
+      ".meta/src/example.cljs"
+    ]
+  },
+  "blurb": "Determine if a sentence is a pangram.",
+  "source": "Wikipedia",
+  "source_url": "https://en.wikipedia.org/wiki/Pangram"
+}

exercises/practice/pangram/.meta/src/example.cljs

@@ -0,0 +1,12 @@
+(ns pangram
+  (:require [clojure.string :refer [lower-case]]))
+
+(defn- char<= [ch1 ch2] (<= (compare ch1 ch2) 0))
+
+(defn pangram? [input]
+  (->> input
+       (into [] (comp (map #(lower-case %))
+                      (filter #(and (char<= \a %) (char<= % \z)))
+                      (distinct)))
+       count
+       (= 26)))

exercises/practice/pangram/.meta/tests.toml

@@ -0,0 +1,33 @@
+# This is an auto-generated file. Regular comments will be removed when this
+# file is regenerated. Regenerating will not touch any manually added keys,
+# so comments can be added in a "comment" key.
+
+[64f61791-508e-4f5c-83ab-05de042b0149]
+description = "empty sentence"
+
+[74858f80-4a4d-478b-8a5e-c6477e4e4e84]
+description = "perfect lower case"
+
+[61288860-35ca-4abe-ba08-f5df76ecbdcd]
+description = "only lower case"
+
+[6564267d-8ac5-4d29-baf2-e7d2e304a743]
+description = "missing the letter 'x'"
+
+[c79af1be-d715-4cdb-a5f2-b2fa3e7e0de0]
+description = "missing the letter 'h'"
+
+[d835ec38-bc8f-48e4-9e36-eb232427b1df]
+description = "with underscores"
+
+[8cc1e080-a178-4494-b4b3-06982c9be2a8]
+description = "with numbers"
+
+[bed96b1c-ff95-45b8-9731-fdbdcb6ede9a]
+description = "missing letters replaced by numbers"
+
+[938bd5d8-ade5-40e2-a2d9-55a338a01030]
+description = "mixed case and punctuation"
+
+[2577bf54-83c8-402d-a64b-a2c0f7bb213a]
+description = "case insensitive"

exercises/practice/pangram/deps.edn

@@ -0,0 +1,10 @@
+{:deps
+ {org.clojure/clojure {:mvn/version "1.10.1"}
+  org.clojure/clojurescript {:mvn/version "1.10.773"}}
+
+ :aliases
+ {:test
+  {:extra-paths ["test"]
+   :extra-deps
+   {olical/cljs-test-runner {:mvn/version "3.8.0"}}
+   :main-opts ["-m" "cljs-test-runner.main"]}}}

exercises/practice/pangram/src/pangram.cljs

@@ -0,0 +1,5 @@
+(ns pangram)
+
+(defn pangram? [] ;; <- arglist goes here
+  ;; your code goes here
+)

exercises/practice/pangram/test/pangram_test.cljs

@@ -0,0 +1,38 @@
+(ns pangram-test
+  (:require [clojure.test :refer [is deftest]]
+            [pangram :refer [pangram?]]))
+
+(deftest empty-sentence
+  (is (false? (pangram? ""))))
+
+(deftest lowercase-pangram
+  (is (pangram? "the quick brown fox jumps over the lazy dog")))
+
+(deftest missing-character-x
+  (is
+   (false?
+    (pangram? "a quick movement of the enemy will jeopardize five gunboats"))))
+
+(deftest another-missing-character-x
+  (is
+   (false?
+    (pangram? "the quick brown fish jumps over the lazy dog"))))
+
+(deftest with-underscores
+  (is (pangram? "the_quick_brown_fox_jumps_over_the_lazy_dog")))
+
+(deftest with-numbers
+  (is (pangram? "the 1 quick brown fox jumps over the 2 lazy dogs")))
+
+(deftest missing-letters-replaced-by-numbers
+  (is
+   (false?
+    (pangram? "7h3 qu1ck brown fox jumps ov3r 7h3 lazy dog"))))
+
+(deftest mixed-case-and-punctuation
+  (is (pangram? "\"Five quacking Zephyrs jolt my wax bed.\"")))
+
+(deftest upper-and-lower-not-counted-separately
+  (is
+   (false?
+    (pangram? "the quick brown fox jumps over with lazy FX"))))