Function ladderLength

javascript/0127-word-ladder.js:9–22

(beginWord, endWord, wordList)

 * @return {number}
 */
var ladderLength = function (beginWord, endWord, wordList) {
    const [queue, wordSet, seen] = [
        new Queue([[beginWord, 1]]),
        new Set(wordList),
        new Set([beginWord]),
    ];

    return bfs(
        queue,
        wordSet,
        seen,
        endWord,
    ); /* Time O(ROWS * COLS) | Space O(ROWS * COLS) */
};

const bfs = (queue, wordSet, seen, endWord) => {
    while (!queue.isEmpty()) {