Wordle color algorithm

wordle_color_algorithm.js

const chalk = require('chalk');

const COLOR_CORRECT_SPOT = 'green';
const COLOR_WRONG_SPOT = 'yellow';
const COLOR_NOT_ANY_SPOT = 'gray';

// From https://codereview.stackexchange.com/a/274334
function guessColor(word, guess, index) {
	// correct (matched) index letter
	if (guess[index] === word[index]) {
		return COLOR_CORRECT_SPOT;
	}

	let wrongWord = (wrongGuess = 0);
	for (let i = 0; i < word.length; i++) {
		// count the wrong (unmatched) letters
		if (word[i] === guess[index] && guess[i] !== guess[index]) {
			wrongWord++;
		}
		if (i <= index) {
			if (guess[i] === guess[index] && word[i] !== guess[index]) {
				wrongGuess++;
			}
		}

		// an unmatched guess letter is wrong if it pairs with
		// an unmatched word letter
		if (i >= index) {
			if (wrongGuess === 0) {
				break;
			}
			if (wrongGuess <= wrongWord) {
				return COLOR_WRONG_SPOT;
			}
		}
	}

	// otherwise not any
	return COLOR_NOT_ANY_SPOT;
}

// printGuess('hello', 'halo')
const printGuess = (word, guess) => {
  let msg = '';
	for (let i = 0; i < word.length; i++) {
		const color = guessColor(word, guess, i);
		const letter = guess.charAt(i);
		msg += chalk[color](letter);
	}
	console.log(msg);
};