Unique Email Addresses

LeetCode 題目: 929. Unique Email Addresses

My solution:

/**
 * @param {string[]} emails
 * @return {number}
 */
let numUniqueEmails = (emails) => {
    let set = new Set;
    for(let i=0; i<emails.length; i++){
        let [local, domain] = emails[i].split('@');
        local = local.replace(/\./g , '').replace(/\+.*/g, '');
        set.add(`${local}@${domain}`);
    }
    return set.size;
};