export class Masking {

  static email(email: string): string {

    const [username, domain] = email.split('@')

    const numStars: number = Math.abs(Math.floor(username.length / 2))

    let maskedUsername: string = ''

​

    if (username.length <= numStars) {

      maskedUsername = '*'.repeat(username.length) + username.slice(-2)

    } else {

      maskedUsername = username.slice(0, -numStars) + '*'.repeat(numStars - 1) + username.slice(-1)

    }

​

    return `${maskedUsername}@${domain}`

  }

​

  static mobile(mobile: string): string {

    const numStars: number = Math.abs(Math.floor(mobile.length / 2))

    return mobile.slice(0, 4) + String('*').repeat(numStars) + mobile.slice(-4)

  }

}

​