Add pangram exercise (#700)

Author: glennj

config.json

@@ -496,6 +496,14 @@
         "prerequisites": [],
         "difficulty": 1
       },
+      {
+        "slug": "pangram",
+        "name": "Pangram",
+        "uuid": "dd2d617f-acfc-4821-b8e8-7323d84852d9",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 2
+      },
       {
         "slug": "pascals-triangle",
         "name": "Pascal's Triangle",

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": [
+    "glennj"
+  ],
+  "files": {
+    "solution": [
+      "lib/Pangram.pm"
+    ],
+    "test": [
+      "t/pangram.t"
+    ],
+    "example": [
+      ".meta/solutions/lib/Pangram.pm"
+    ]
+  },
+  "blurb": "Determine if a sentence is a pangram.",
+  "source": "Wikipedia",
+  "source_url": "https://en.wikipedia.org/wiki/Pangram"
+}

exercises/practice/pangram/.meta/solutions/lib/Pangram.pm

@@ -0,0 +1,17 @@
+package Pangram;
+
+use strict;
+use warnings;
+use experimental qw<signatures postderef postderef_qq>;
+
+use Exporter qw<import>;
+our @EXPORT_OK = qw<is_pangram>;
+
+use List::Util qw(uniq);
+
+sub is_pangram ($text) {
+    my @letters = grep {/[[:alpha:]]/} split "", lc $text;
+    return scalar( uniq @letters ) == 26;
+}
+
+1;

exercises/practice/pangram/.meta/solutions/t/pangram.t

@@ -0,0 +1 @@
+../../../t/pangram.t

exercises/practice/pangram/.meta/template-data.yaml

@@ -0,0 +1,26 @@
+subs: is_pangram
+
+properties:
+  isPangram:
+    test: |-
+      use Data::Dmp;
+      sprintf(<<'END', dmp($case->{input}{sentence}), $case->{expected} ? ('T', '# True') : ('DF', '# Defined but False'), dmp($case->{description}));
+      is(
+        is_pangram(%s),
+        %s, %s
+        %s
+      );
+      END
+
+stub: |-
+  sub is_pangram ($text) {
+    return undef;
+  }
+
+example: |-
+  use List::Util qw(uniq);
+
+  sub is_pangram ($text) {
+    my @letters = grep { /[[:alpha:]]/ } split "", lc $text;
+    return scalar(uniq @letters) == 26;
+  }

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

@@ -0,0 +1,45 @@
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via 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"
+include = false
+
+[7138e389-83e4-4c6e-8413-1e40a0076951]
+description = "a-m and A-M are 26 different characters but not a pangram"
+reimplements = "2577bf54-83c8-402d-a64b-a2c0f7bb213a"

exercises/practice/pangram/lib/Pangram.pm

@@ -0,0 +1,12 @@
+package Pangram;
+
+use v5.40;
+
+use Exporter qw<import>;
+our @EXPORT_OK = qw<is_pangram>;
+
+sub is_pangram ($text) {
+    return undef;
+}
+
+1;

exercises/practice/pangram/t/pangram.t

@@ -0,0 +1,69 @@
+#!/usr/bin/env perl
+use Test2::V0;
+
+use FindBin qw<$Bin>;
+use lib "$Bin/../lib", "$Bin/../local/lib/perl5";
+
+use Pangram qw<is_pangram>;
+
+is( # begin: 64f61791-508e-4f5c-83ab-05de042b0149
+    is_pangram(""),
+    DF, # Defined but False
+    "empty sentence"
+); # end: 64f61791-508e-4f5c-83ab-05de042b0149
+
+is( # begin: 74858f80-4a4d-478b-8a5e-c6477e4e4e84
+    is_pangram("abcdefghijklmnopqrstuvwxyz"),
+    T, # True
+    "perfect lower case"
+); # end: 74858f80-4a4d-478b-8a5e-c6477e4e4e84
+
+is( # begin: 61288860-35ca-4abe-ba08-f5df76ecbdcd
+    is_pangram("the quick brown fox jumps over the lazy dog"),
+    T, # True
+    "only lower case"
+); # end: 61288860-35ca-4abe-ba08-f5df76ecbdcd
+
+is( # begin: 6564267d-8ac5-4d29-baf2-e7d2e304a743
+    is_pangram("a quick movement of the enemy will jeopardize five gunboats"),
+    DF, # Defined but False
+    "missing the letter 'x'"
+); # end: 6564267d-8ac5-4d29-baf2-e7d2e304a743
+
+is( # begin: c79af1be-d715-4cdb-a5f2-b2fa3e7e0de0
+    is_pangram("five boxing wizards jump quickly at it"),
+    DF, # Defined but False
+    "missing the letter 'h'"
+); # end: c79af1be-d715-4cdb-a5f2-b2fa3e7e0de0
+
+is( # begin: d835ec38-bc8f-48e4-9e36-eb232427b1df
+    is_pangram("the_quick_brown_fox_jumps_over_the_lazy_dog"),
+    T, # True
+    "with underscores"
+); # end: d835ec38-bc8f-48e4-9e36-eb232427b1df
+
+is( # begin: 8cc1e080-a178-4494-b4b3-06982c9be2a8
+    is_pangram("the 1 quick brown fox jumps over the 2 lazy dogs"),
+    T, # True
+    "with numbers"
+); # end: 8cc1e080-a178-4494-b4b3-06982c9be2a8
+
+is( # begin: bed96b1c-ff95-45b8-9731-fdbdcb6ede9a
+    is_pangram("7h3 qu1ck brown fox jumps ov3r 7h3 lazy dog"),
+    DF, # Defined but False
+    "missing letters replaced by numbers"
+); # end: bed96b1c-ff95-45b8-9731-fdbdcb6ede9a
+
+is( # begin: 938bd5d8-ade5-40e2-a2d9-55a338a01030
+    is_pangram("\"Five quacking Zephyrs jolt my wax bed.\""),
+    T, # True
+    "mixed case and punctuation"
+); # end: 938bd5d8-ade5-40e2-a2d9-55a338a01030
+
+is( # begin: 7138e389-83e4-4c6e-8413-1e40a0076951
+    is_pangram("abcdefghijklm ABCDEFGHIJKLM"),
+    DF, # Defined but False
+    "a-m and A-M are 26 different characters but not a pangram"
+); # end: 7138e389-83e4-4c6e-8413-1e40a0076951
+
+done_testing;