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import assertString from './util/assertString';
var isin = /^[A-Z]{2}[0-9A-Z]{9}[0-9]$/;
export default function isISIN(str) {
assertString(str);
if (!isin.test(str)) {
return false;
}
var checksumStr = str.replace(/[A-Z]/g, function (character) {
return parseInt(character, 36);
});
var sum = 0;
var digit;
var tmpNum;
var shouldDouble = true;
for (var i = checksumStr.length - 2; i >= 0; i--) {
digit = checksumStr.substring(i, i + 1);
tmpNum = parseInt(digit, 10);
if (shouldDouble) {
tmpNum *= 2;
if (tmpNum >= 10) {
sum += tmpNum + 1;
} else {
sum += tmpNum;
}
} else {
sum += tmpNum;
}
shouldDouble = !shouldDouble;
}
return parseInt(str.substr(str.length - 1), 10) === (10000 - sum) % 10;
}
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