Function transform

javascript/0127-word-ladder.js:39–51

(queue, wordSet, seen, word, depth)

};

const transform = (queue, wordSet, seen, word, depth) => {
    for (const index in word) {
        for (const char of 'abcdefghijklmnopqrstuvwxyz') {
            const neighbor = getNeighbor(word, index, char);

            const hasSeen = !wordSet.has(neighbor) || seen.has(neighbor);
            if (hasSeen) continue;

            queue.enqueue([neighbor, depth + 1]);
            seen.add(neighbor);
        }
    }
};

const getNeighbor = (word, index, char) => {
    const neighbor = word.split('');