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[JS][7kyu] Guess the Word: Count Matching Letters #5255

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[JS][7kyu] Guess the Word: Count Matching Letters #5255

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19 changes: 19 additions & 0 deletions 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