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11 changes: 11 additions & 0 deletions js-core/homeworks/homework-21/index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Home work 21</title>
</head>
<body>

<script src="src/main.js"></script>
</body>
</html>
36 changes: 36 additions & 0 deletions js-core/homeworks/homework-21/src/main.js
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/* TASK 0
Сделайте валидацию кредитной карты, валидация происходит
используя алгоритм Луна.
Простое описание:
1. Начиная с последнего правого числа, двигаясь влево,
умножайте каждое второе число на 2,
если результат умножения больше 9
(например 8 х 2 = 16),
тогда сумируйте получившиеся число
(например 16: 1+6 = 7, 18: 1+8 = 9).
2. Получите сумму всех чисел.
3. Если сумма всех чисел кратно 10, тогда число является подходящим,
иначе нет.
P.S. -> проверьте на свой карте.
arguments ["4408041234567893"] => expected true
arguments ["1234567890123456"] => expected false
arguments ["4408042234567893"] => expected false
arguments ["38520000023237"] => expected true
arguments ["4222222222222"] => expected true
*/

const solution = (credit_num) => {
return !(credit_num.split("").reverse().map((checkNum, i) => {
checkNum = parseInt(checkNum, 10);
return i % 2 == 0
? checkNum
: (checkNum *= 2) > 9 ? checkNum - 9 : checkNum;
}).reduce((a, b) => a + b) % 10);
}

console.log(solution('4408041234567893'));
console.log(solution('1234567890123456'));
console.log(solution('4408042234567893'));
console.log(solution('38520000023237'));
console.log(solution('4222222222222'));