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@toddDec 02.2022 — #To detect the type of a Credit card based on its number in JavaScript, you can use a regular expression to match the pattern of the Credit card number against known patterns for different card types. Here's an example:
To use this function, you would call it with a Credit card number as the argument, like this:
This function uses regular expressions to match the Credit card number against known patterns for different card types. If the number matches a pattern, the function returns the name of the card type. If the number does not match any known pattern, the function returns 'Unknown'.
What is the method for determining the type of a Credit card based on its number?
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@toddDec 02.2022 — #To detect the type of a Credit card based on its number in JavaScript, you can use a regular expression to match the pattern of the Credit card number against known patterns for different card types. Here's an example:
function detectCardType(cardNumber) {
// American Express card numbers start with 34 or 37 and have 15 digits
if (/^(34|37)\d{13}$/.test(cardNumber)) {
return 'American Express';
}
// Visa card numbers start with 4 and have 13 or 16 digits
if (/^4\d{12}(?:\d{3})?$/.test(cardNumber)) {
return 'Visa';
}
// Mastercard card numbers start with 51, 52, 53, 54, or 55 and have 16 digits
if (/^5[1-5]\d{14}$/.test(cardNumber)) {
return 'Mastercard';
}
// Discover card numbers start with 6011, 622126-622925, or 644-649 and have 16 digits
if (/^(6011|622(?:12[6-9]|1[3-9][0-9]|[2-8][0-9]{2}|9[0-1][0-9]|92[0-5]|64[4-9])|65)\d{12}$/.test(cardNumber)) {
return 'Discover';
}
// If none of the above patterns match, the card type cannot be determined
return 'Unknown';
}
To use this function, you would call it with a Credit card number as the argument, like this:
const cardType = detectCardType('4111 1111 1111 1111');
console.log(cardType); // 'Visa'
This function uses regular expressions to match the Credit card number against known patterns for different card types. If the number matches a pattern, the function returns the name of the card type. If the number does not match any known pattern, the function returns 'Unknown'.