Add isogram exercise

config.json

@@ -348,6 +348,14 @@
         "prerequisites": [],
         "difficulty": 1
       },
+      {
+        "slug": "isogram",
+        "name": "Isogram",
+        "uuid": "bb80818d-3e3e-4b17-b240-a9ffff33acf2",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 2
+      },
       {
         "slug": "kindergarten-garden",
         "name": "Kindergarten Garden",

exercises/practice/isogram/.docs/instructions.md

@@ -0,0 +1,14 @@
+# Instructions
+
+Determine if a word or phrase is an isogram.
+
+An isogram (also known as a "non-pattern word") is a word or phrase without a repeating letter, however spaces and hyphens are allowed to appear multiple times.
+
+Examples of isograms:
+
+- lumberjacks
+- background
+- downstream
+- six-year-old
+
+The word _isograms_, however, is not an isogram, because the s repeats.

exercises/practice/isogram/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "glennj"
+  ],
+  "files": {
+    "solution": [
+      "lib/Isogram.pm"
+    ],
+    "test": [
+      "t/isogram.t"
+    ],
+    "example": [
+      ".meta/solutions/lib/Isogram.pm"
+    ]
+  },
+  "blurb": "Determine if a word or phrase is an isogram.",
+  "source": "Wikipedia",
+  "source_url": "https://en.wikipedia.org/wiki/Isogram"
+}

exercises/practice/isogram/.meta/solutions/lib/Isogram.pm

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

exercises/practice/isogram/.meta/solutions/t/isogram.t

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

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

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

exercises/practice/isogram/.meta/tests.toml

@@ -0,0 +1,52 @@
+# 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.
+
+[a0e97d2d-669e-47c7-8134-518a1e2c4555]
+description = "empty string"
+
+[9a001b50-f194-4143-bc29-2af5ec1ef652]
+description = "isogram with only lower case characters"
+
+[8ddb0ca3-276e-4f8b-89da-d95d5bae78a4]
+description = "word with one duplicated character"
+
+[6450b333-cbc2-4b24-a723-0b459b34fe18]
+description = "word with one duplicated character from the end of the alphabet"
+
+[a15ff557-dd04-4764-99e7-02cc1a385863]
+description = "longest reported english isogram"
+
+[f1a7f6c7-a42f-4915-91d7-35b2ea11c92e]
+description = "word with duplicated character in mixed case"
+
+[14a4f3c1-3b47-4695-b645-53d328298942]
+description = "word with duplicated character in mixed case, lowercase first"
+
+[423b850c-7090-4a8a-b057-97f1cadd7c42]
+description = "hypothetical isogrammic word with hyphen"
+
+[93dbeaa0-3c5a-45c2-8b25-428b8eacd4f2]
+description = "hypothetical word with duplicated character following hyphen"
+
+[36b30e5c-173f-49c6-a515-93a3e825553f]
+description = "isogram with duplicated hyphen"
+
+[cdabafa0-c9f4-4c1f-b142-689c6ee17d93]
+description = "made-up name that is an isogram"
+
+[5fc61048-d74e-48fd-bc34-abfc21552d4d]
+description = "duplicated character in the middle"
+
+[310ac53d-8932-47bc-bbb4-b2b94f25a83e]
+description = "same first and last characters"
+
+[0d0b8644-0a1e-4a31-a432-2b3ee270d847]
+description = "word with duplicated character and with two hyphens"

exercises/practice/isogram/lib/Isogram.pm

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

exercises/practice/isogram/t/isogram.t

@@ -0,0 +1,93 @@
+#!/usr/bin/env perl
+use Test2::V0;
+
+use FindBin qw<$Bin>;
+use lib "$Bin/../lib", "$Bin/../local/lib/perl5";
+
+use Isogram qw<is_isogram>;
+
+is( # begin: a0e97d2d-669e-47c7-8134-518a1e2c4555
+    is_isogram(""),
+    T, # True
+    "empty string"
+); # end: a0e97d2d-669e-47c7-8134-518a1e2c4555
+
+is( # begin: 9a001b50-f194-4143-bc29-2af5ec1ef652
+    is_isogram("isogram"),
+    T, # True
+    "isogram with only lower case characters"
+); # end: 9a001b50-f194-4143-bc29-2af5ec1ef652
+
+is( # begin: 8ddb0ca3-276e-4f8b-89da-d95d5bae78a4
+    is_isogram("eleven"),
+    DF, # Defined but False
+    "word with one duplicated character"
+); # end: 8ddb0ca3-276e-4f8b-89da-d95d5bae78a4
+
+is( # begin: 6450b333-cbc2-4b24-a723-0b459b34fe18
+    is_isogram("zzyzx"),
+    DF, # Defined but False
+    "word with one duplicated character from the end of the alphabet"
+); # end: 6450b333-cbc2-4b24-a723-0b459b34fe18
+
+is( # begin: a15ff557-dd04-4764-99e7-02cc1a385863
+    is_isogram("subdermatoglyphic"),
+    T, # True
+    "longest reported english isogram"
+); # end: a15ff557-dd04-4764-99e7-02cc1a385863
+
+is( # begin: f1a7f6c7-a42f-4915-91d7-35b2ea11c92e
+    is_isogram("Alphabet"),
+    DF, # Defined but False
+    "word with duplicated character in mixed case"
+); # end: f1a7f6c7-a42f-4915-91d7-35b2ea11c92e
+
+is( # begin: 14a4f3c1-3b47-4695-b645-53d328298942
+    is_isogram("alphAbet"),
+    DF, # Defined but False
+    "word with duplicated character in mixed case, lowercase first"
+); # end: 14a4f3c1-3b47-4695-b645-53d328298942
+
+is( # begin: 423b850c-7090-4a8a-b057-97f1cadd7c42
+    is_isogram("thumbscrew-japingly"),
+    T, # True
+    "hypothetical isogrammic word with hyphen"
+); # end: 423b850c-7090-4a8a-b057-97f1cadd7c42
+
+is( # begin: 93dbeaa0-3c5a-45c2-8b25-428b8eacd4f2
+    is_isogram("thumbscrew-jappingly"),
+    DF, # Defined but False
+    "hypothetical word with duplicated character following hyphen"
+); # end: 93dbeaa0-3c5a-45c2-8b25-428b8eacd4f2
+
+is( # begin: 36b30e5c-173f-49c6-a515-93a3e825553f
+    is_isogram("six-year-old"),
+    T, # True
+    "isogram with duplicated hyphen"
+); # end: 36b30e5c-173f-49c6-a515-93a3e825553f
+
+is( # begin: cdabafa0-c9f4-4c1f-b142-689c6ee17d93
+    is_isogram("Emily Jung Schwartzkopf"),
+    T, # True
+    "made-up name that is an isogram"
+); # end: cdabafa0-c9f4-4c1f-b142-689c6ee17d93
+
+is( # begin: 5fc61048-d74e-48fd-bc34-abfc21552d4d
+    is_isogram("accentor"),
+    DF, # Defined but False
+    "duplicated character in the middle"
+); # end: 5fc61048-d74e-48fd-bc34-abfc21552d4d
+
+is( # begin: 310ac53d-8932-47bc-bbb4-b2b94f25a83e
+    is_isogram("angola"),
+    DF, # Defined but False
+    "same first and last characters"
+); # end: 310ac53d-8932-47bc-bbb4-b2b94f25a83e
+
+is( # begin: 0d0b8644-0a1e-4a31-a432-2b3ee270d847
+    is_isogram("up-to-date"),
+    DF, # Defined but False
+    "word with duplicated character and with two hyphens"
+); # end: 0d0b8644-0a1e-4a31-a432-2b3ee270d847
+
+done_testing;