Jason Fernando is a professional investor and writer who enjoys tackling and communicating complex business and financial problems. Khadija Khartit is a strategy, investment, and funding expert, and ...
card-number-validation-api/ ├── src/ │ ├── index.ts # Express app and API endpoint │ ├── cardValidator.ts # Card validation logic (Luhn algorithm) │ ├── cardValidator.test.ts # Unit tests │ └── ...
You’re at the checkout screen after an online shopping spree, ready to enter your credit card number. You type it in and instantly see a red error message ...
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