[JS][5kyu] Readability is King

codewars/5kyu/readability-is-king/koronya.js

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+// [JS][5kyu] Readability is King
+// readability-is-king
+// https://www.codewars.com/kata/52b2cf1386b31630870005d4/train/javascript
+
+const VOWEL_LIST = ['a', 'e', 'i', 'o', 'u']
+
+const getSyllables = (word) => {
+  word = word.replace(/[^a-z]/g, '')
+  const wordLength = word.length
+  let prev = word[0]
+  let count = VOWEL_LIST.includes(prev) ? 1 : 0
+  for (let i = 1; i < wordLength; i += 1 || 0) {
+    const curr = word[i]
+    if (VOWEL_LIST.includes(curr) && !VOWEL_LIST.includes(prev)) {
+      count += 1
+    }
+    prev = curr
+  }
+  return count
+}
+
+const fleschKincaid = (text) => {
+  const sentenceList = text
+    .split(/[.!?]+/)
+    .map((s) => s.trim())
+    .filter((s) => s.length > 0)
+  const wordList = text.toLowerCase().match(/[a-z]+/g) ?? []
+  const avgWordPerSentence = wordList.length / sentenceList.length
+  const syllables = wordList.reduce((acc, curr) => acc + getSyllables(curr), 0)
+  const avgSyllablesPerWord = syllables / wordList.length
+  const result = 0.39 * avgWordPerSentence + 11.8 * avgSyllablesPerWord - 15.59
+
+  return Math.round(result * 100) / 100
+}
+
+// fleschKincaid('The turtle is leaving.') === 3.67
+// fleschKincaid('A good book is hard to find.') === -1.06
+// fleschKincaid('To be or not to be. That is the question.') === -0.66
+// fleschKincaid('Oh no! The lemming is falling.') === 1.31
+// fleschKincaid('Do not cut your fingers as your katana is getting sharper! Be gentle.') === 4.19