LeetCode 2185. Counting Words With a Given Prefix

問題：取得文字前綴詞相同數量 解法：RegExp JavaScript

/**
 * @param {string[]} words
 * @param {string} pref
 * @return {number}
 */
var prefixCount = function (words, pref) {
    if (words.length < 1 || words.length > 100) {
        return;
    }

    const reg = new RegExp(`^${pref}`);
    let count = 0;
    words.forEach(s => {
        if (reg.test(s)) {
            count++;
        }
        return;
    })

    return count;
};