Luhn algorithm: Difference between revisions

Revision as of 05:19, 16 March 2024

Revision as of 21:11, 18 April 2024

Line 160:

</syntaxhighlight>

=== [[TypeScript]] ===

<syntaxhighlight lang="typescript" line="1">

function luhnCheck(input: number): boolean {

const number = input.toString();

const digits = number.replace(/\D/g, '').split('').map(Number);

let sum = 0;

let isSecond = false;

for (let i = digits.length - 1; i >= 0; i--) {

let digit = digits[i];

if (isSecond) {

digit *= 2;

if (digit > 9) {

digit -= 9;

}

}

sum += digit;

isSecond = !isSecond;

}

return sum % 10 === 0;

}

</syntaxhighlight>

== Uses ==

The Luhn algorithm is used in a variety of systems, including: