Coffee cups indicate the complexity of a file, tip or article. One coffee cup is the easiest and three is the most advanced.
To download a file, click on the green arrow icon next to the listing. If there are no coffee cups
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This technique has changed so dramatically since I originally published it 10 years ago that it doesn't even look the same. The result is the same, but the way you get there is much easier to understand. In addition, the auto-enter feature is used, so there is no need to trick the user with multiple fields. Phone, Social Security Number (SSN) and Credit Card examples are filtered in this example.
Validates credit card numbers. It doesn't tell you whether the credit card has cleared the bank, but rather serves as a way to prevent typos. The algorithm is able to determine if the digits in the card number follow the correct pattern.
Tip File
Tip File
