Typescript(Javascript) Email Security Function (타입스크립트(자바스크립트) 이메일 블러처리 함수)

emailSecurity.ts

export function emailSecurity(userEmail: string){
  const id = userEmail.split('@')[0];
  const mail = userEmail.split('@')[1];
  const maskingId = function(id: string) {
    let splitId = id.substring(0,4);
    for(let i = 4; i < id.length; i++) {
      splitId += '*';
    }
    return splitId;
  };
  const maskingMail = function(mail: string){
    let splitMail = '';
    for(let i = 5; i < mail.length; i++){
      splitMail += '*';
    }
    splitMail += mail.substring(mail.length - 5, mail.length);
    return splitMail;
  };
  userEmail = maskingId(id) + '@' + maskingMail(mail);
  return userEmail;
}