929 独特的电子邮件地址

版权声明：转载的话和我说一声 https://blog.csdn.net/holiday19950913/article/details/85385079

var numUniqueEmails = function(emails) {
    const arr = emails.map((val) => {
        return (val.split('@')[0].replace(/\./g, '') + '@'+val.split('@')[1]).replace(/\+.*(?=@)/, '')
    })
    return [...new Set(arr)].length;
};