From dc46c9af3228d250b23fe250fa5297d7eaa13859 Mon Sep 17 00:00:00 2001
From: Seth Etter <sethetter@gmail.com>
Date: Sun, 13 Dec 2015 08:59:36 -0600
Subject: [PATCH] Day 5, part 1

---
 index.js          |   12 +
 input/day5.txt    | 1000 +++++++++++++++++++++++++++++++++++++++++++++
 lib/day5.js       |   41 ++
 spec/day5.spec.js |   54 +++
 4 files changed, 1107 insertions(+)
 create mode 100644 input/day5.txt
 create mode 100644 lib/day5.js
 create mode 100644 spec/day5.spec.js

diff --git a/index.js b/index.js
index 030464e..d624afa 100644
--- a/index.js
+++ b/index.js
@@ -23,3 +23,15 @@ var day4Part1Answer = Day4.adventCoinSecret(day4Input, '00000');
 var day4Part2Answer = Day4.adventCoinSecret(day4Input, '000000');
 console.log('Day 4, Part 1:', day4Part1Answer);
 console.log('Day 4, Part 2:', day4Part2Answer);
+
+/**
+ * Day 5!
+ * ----------------------------------
+ */
+var Day5 = require('./lib/day5');
+var day5Input = fs.readFileSync('./input/day5.txt', 'utf8');
+var niceStringCount = 0;
+day5Input.split('\n').forEach(function(str) {
+  if (Day5.isStringNice(str)) niceStringCount++;
+});
+console.log('Day 5, Part 1:', niceStringCount);
diff --git a/input/day5.txt b/input/day5.txt
new file mode 100644
index 0000000..7bc179c
--- /dev/null
+++ b/input/day5.txt
@@ -0,0 +1,1000 @@
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diff --git a/lib/day5.js b/lib/day5.js
new file mode 100644
index 0000000..570ee38
--- /dev/null
+++ b/lib/day5.js
@@ -0,0 +1,41 @@
+var VOWELS = ['a', 'e', 'i', 'o', 'u'];
+var BAD_COMBOS = ['ab', 'cd', 'pq', 'xy'];
+
+module.exports = {
+  isStringNice: function(str) {
+    return (
+      this.hasThreeVowels(str)
+      && this.hasDoubleLetter(str)
+      && !this.hasBadCombos(str)
+    );
+  },
+
+  hasThreeVowels: function(str) {
+    var count = 0;
+
+    str.split('').forEach(function(char) {
+      if (VOWELS.indexOf(char) !== -1) count++;
+    });
+
+    return count >= 3;
+  },
+
+  hasDoubleLetter: function(str) {
+    var lastChar = null;
+    var chars = str.split('');
+
+    for (var i = 0; i < chars.length; i++) {
+      if (chars[i] === lastChar) return true;
+      lastChar = chars[i];
+    }
+    
+    return false;
+  },
+
+  hasBadCombos: function(str) {
+    for (var i = 0; i < BAD_COMBOS.length; i++) {
+      if (str.indexOf(BAD_COMBOS[i]) !== -1) return true;
+    }
+    return false;
+  }
+};
diff --git a/spec/day5.spec.js b/spec/day5.spec.js
new file mode 100644
index 0000000..5f8d27b
--- /dev/null
+++ b/spec/day5.spec.js
@@ -0,0 +1,54 @@
+var expect = require('chai').expect;
+var Day5 = require('../lib/day5');
+
+describe('Day5', function() {
+  describe('#hasThreeVowels', function() {
+    it('checks for at least 3 vowels', function() {
+      var niceString = 'axcejill';
+      var badString = 'aell';
+      expect(Day5.hasThreeVowels(niceString)).to.equal(true);
+      expect(Day5.hasThreeVowels(badString)).to.equal(false);
+    });
+  });
+
+  describe('#hasDoubleLetter', function() {
+    it('has at least one double letter', function() {
+      var niceString = 'asddfmn';
+      var badString = 'bniosdnf';
+      expect(Day5.hasDoubleLetter(niceString)).to.equal(true);
+      expect(Day5.hasDoubleLetter(badString)).to.equal(false);
+    });
+  });
+
+  describe('#hasBadCombos', function() {
+    it('does not contain "ab" "cd" "pq" or "xy"', function() {
+      var niceString = 'aosidfjo';
+      var badStrings = [
+        'oisdjfoiab',
+        'ajossdjfcd',
+        'ajossdjfpq',
+        'ajossdjfxy'
+      ];
+
+      expect(Day5.hasBadCombos(niceString)).to.equal(false);
+      badStrings.forEach(function(str) {
+        expect(Day5.hasBadCombos(str)).to.equal(true);
+      });
+    });
+  });
+
+  describe('#isStringNice', function() {
+    it('checks for all three nice conditions', function() {
+      var goodStrings = ['aeibb', 'oouidd', 'lkajlsdffie'];
+      var badStrings = ['bbbbbbb', 'abbei', 'aeiobx'];
+
+      goodStrings.forEach(function(str) {
+        expect(Day5.isStringNice(str)).to.equal(true);
+      });
+
+      badStrings.forEach(function(str) {
+        expect(Day5.isStringNice(str)).to.equal(false);
+      });
+    });
+  });
+});
-- 
2.51.2