Mask All Credit Card Digits But Last Four

Mask All Credit Card Digits But Last Four
Mask all the credit card number digits with asterisks except the last 4, for security purposes. The function works for all types of cards (Visa, MasterCard, Amex, Discovery, etc.)
1. def HideCCDigits(CardNum)
2.   CardNum.sub((part = CardNum[0..-5]), '*' * part.length)
3. end
Nathan Pakovskie is an esteemed senior developer and educator in the tech community, best known for his contributions to With a passion for coding and a knack for simplifying complex tech concepts, Nathan has authored several popular tutorials on C# programming, ranging from basic operations to advanced coding techniques. His articles, often characterized by clarity and precision, serve as invaluable resources for both novice and experienced programmers. Beyond his technical expertise, Nathan is an advocate for continuous learning and enjoys exploring emerging technologies in AI and software development. When he’s not coding or writing, Nathan engages in mentoring upcoming developers, emphasizing the importance of both technical skills and creative problem-solving in the ever-evolving world of technology. Specialties: C# Programming, Technical Writing, Software Development, AI Technologies, Educational Outreach

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