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@BenDMyers
Created January 17, 2022 04:51
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RWC Wordle Validation
const CORRECT = 'correct';
const OUT_OF_PLACE = 'out of place';
const WRONG = 'wrong';
/**
* Determines which letters in a given guess are correct, which ones are out of place, and which ones are invalid and returns emoji string
* @param {string} guess five-letter guess (presumes the guess has already been through other formatting validations like length and valid characters)
* @param {string} solution the target word the player is trying to guess
* @returns {string} emoji sequence
*/
function validateWordleGuess(guess, solution) {
/**
* @type {{letter: string, state: CORRECT | OUT_OF_PLACE | WRONG}[]}
*/
const guessedLetters = guess
.split('')
.map(letter => ({letter, state: WRONG}));
/**
* @type {{letter: string, includedInGuess: boolean}[]}
*/
const solutionLetters = solution
.split('')
.map(letter => ({letter, includedInGuess: false}));
// First pass: correct letters in the correct place
for (let i = 0; i < guessedLetters.length; i++) {
if (guessedLetters[i].letter === solutionLetters[i].letter) {
guessedLetters[i].state = CORRECT;
solutionLetters[i].includedInGuess = true;
}
}
// Second pass: correct letters in the wrong places
for (let i = 0; i < guessedLetters.length; i++) {
if (guessedLetters[i].state === CORRECT) {
continue;
}
const letterFoundElsewhere = solutionLetters
.find((solutionLetter) => {
const matchesLetter = solutionLetter.letter === guessedLetters[i].letter;
return matchesLetter && !solutionLetter.includedInGuess;
});
if (letterFoundElsewhere) {
guessedLetters[i].state = OUT_OF_PLACE;
letterFoundElsewhere.includedInGuess = true;
}
}
const emojis = guessedLetters.map(guessedLetter => {
switch (guessedLetter.state) {
case CORRECT:
return '🟩';
case OUT_OF_PLACE:
return '🟨';
case WRONG:
default:
return '⬛';
}
});
return emojis.join('');
}
console.log(validateWordleGuess('reads', 'fudge'));
console.log(validateWordleGuess('lodge', 'fudge'));
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