diff --git a/codewars/7kyu/guess-the-word-count-matching-letters/koronya.js b/codewars/7kyu/guess-the-word-count-matching-letters/koronya.js
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+++ b/codewars/7kyu/guess-the-word-count-matching-letters/koronya.js
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+// [JS][7kyu] Guess the Word: Count Matching Letters
+// guess-the-word-count-matching-letters
+// https://www.codewars.com/kata/5912ded3f9f87fd271000120/train/javascript
+
+const countCorrectCharacters = (correctWord, guess) => {
+  const correctWordArr = correctWord.split('')
+  const guessArr = guess.split('')
+  if (correctWordArr.length !== guessArr.length) {
+    throw new Error('Words must be of the same length')
+  }
+  return correctWordArr.reduce((acc, curr, index) => acc + (curr === guessArr[index] ? 1 : 0), 0)
+}
+
+countCorrectCharacters('dog', 'car') === 0
+countCorrectCharacters('dog', 'god') === 1
+countCorrectCharacters('dog', 'cog') === 2
+countCorrectCharacters('dog', 'cod') === 1
+countCorrectCharacters('dog', 'bog') === 2
+countCorrectCharacters('dog', 'dog') === 3