From a62c22030ea36cabc1f6bf264d49bfef99dff383 Mon Sep 17 00:00:00 2001
From: Oliver Davies <oliver@oliverdavies.uk>
Date: Sun, 12 Jul 2020 16:54:11 +0100
Subject: [PATCH] Pangram

---
 README.md             |  1 +
 composer.json         |  5 ++++-
 src/Pangram.php       | 14 ++++++++++++++
 tests/PangramTest.php | 19 +++++++++++++++++++
 4 files changed, 38 insertions(+), 1 deletion(-)
 create mode 100644 src/Pangram.php
 create mode 100644 tests/PangramTest.php

diff --git a/README.md b/README.md
index bd6dca0..d46071f 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,7 @@ Includes:
 - **Bob**: returns different responses based on input.
 - **Bowling**: calculate the score for a game of bowling.
 - **Grade School**: given students' names along with the grade that they are in, create a roster for the school.
+- **Pangram** - determine if a sentence is a pangram (every letter of the alphabet is used at least once).
 - **Rock, paper, scissors**
 - **Roman numerals**: convert a number into its roman numeral value.
 
diff --git a/composer.json b/composer.json
index 709c257..3b6e4a4 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,10 @@
         "phpunit/phpunit": "^9.0"
     },
     "autoload": {
-        "files": ["src/FlattenArray.php"],
+        "files": [
+            "src/FlattenArray.php",
+            "src/Pangram.php"
+        ],
         "psr-4": {
             "App\\": "src/"
         }
diff --git a/src/Pangram.php b/src/Pangram.php
new file mode 100644
index 0000000..67811d5
--- /dev/null
+++ b/src/Pangram.php
@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App;
+
+function isPangram(string $input): bool
+{
+    $split = str_split($input);
+    $lower = array_map('strtolower', $split);
+    $filtered = array_filter($lower, fn(string $letter) => $letter != ' ');
+
+    return count(array_unique($filtered)) == 26;
+}
diff --git a/tests/PangramTest.php b/tests/PangramTest.php
new file mode 100644
index 0000000..ab8d041
--- /dev/null
+++ b/tests/PangramTest.php
@@ -0,0 +1,19 @@
+<?php
+
+use function App\isPangram;
+
+it('determines if a string is a pangram', function (
+    string $input,
+    bool $expected
+) {
+    assertSame($expected, isPangram($input));
+})->with([
+    [
+        'input' => 'hello word',
+        'expected' => false,
+    ],
+    [
+        'input' => 'The quick brown fox jumps over the lazy dog',
+        'expected' => true,
+    ]
+]);
\ No newline at end of file