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hw21 #32

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11 changes: 11 additions & 0 deletions js-core/homeworks/homework-21/index.html
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Original file line number Diff line number Diff line change
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Home work 1</title>
</head>
<body>

<script src="src/main.js"></script>
</body>
</html>
47 changes: 47 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
*/
var arguments = str => {
var arr = str.split('');
let arr1 = arr.map((value, i) => {
if (i % 2 == 0) {
let temp = value * 2;
if (temp > 9) {
temp = '' + temp;
temp = +temp.charAt(0) + +temp.charAt(1);
return temp;
} else {
return temp;
}
} else {
return +value;
}
});
var result = arr1.reduce(function(sum, current) {
return sum + current;
}, 0);
let t = ('' + result).charAt(1) == 0 ? 'expected true' : 'expected false';
console.log(t)
}
arguments("4408041234567893");
arguments("1234567890123456");
arguments("4408042234567893");
arguments("38520000023237");
arguments("4222222222222");