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import 'package:flutter/material.dart'; | |
import 'dart:async'; | |
void main() => runApp(new BackButtonOverrideDemoWidget()); | |
class BackButtonOverrideDemoWidget extends StatefulWidget{ | |
@override | |
_BackButtonOverrideDemoWidgetState createState() => new _BackButtonOverrideDemoWidgetState(); | |
} |
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// Takes a credit card string value and returns true on valid number | |
function valid_credit_card(value) { | |
// Accept only digits, dashes or spaces | |
if (/[^0-9-\s]+/.test(value)) return false; | |
// The Luhn Algorithm. It's so pretty. | |
let nCheck = 0, bEven = false; | |
value = value.replace(/\D/g, ""); | |
for (var n = value.length - 1; n >= 0; n--) { |
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/** | |
* Luhn algorithm in JavaScript: validate credit card number supplied as string of numbers | |
* @author ShirtlessKirk. Copyright (c) 2012. | |
* @license WTFPL (http://www.wtfpl.net/txt/copying) | |
*/ | |
var luhnChk = (function (arr) { | |
return function (ccNum) { | |
var | |
len = ccNum.length, | |
bit = 1, |