Feat: add new Markdown parser (#39800)
and change all the challenges to new `md` format.
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Oliver Eyton-Williams
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---
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title: IBAN
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id: 5a23c84252665b21eecc7eaf
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title: IBAN
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challengeType: 5
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forumTopicId: 302289
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---
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## Description
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<section id='description'>
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The <a href="https://en.wikipedia.org/wiki/International_Bank_Account_Number" target="_blank">International Bank Account Number (IBAN)</a> is an internationally agreed means of identifying bank accounts across national borders with a reduced risk of propagating <a href="https://en.wikipedia.org/wiki/Transcription_error" target="_blank">transcription errors</a>.
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# --description--
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The [International Bank Account Number (IBAN)](https://en.wikipedia.org/wiki/International_Bank_Account_Number) is an internationally agreed means of identifying bank accounts across national borders with a reduced risk of propagating [transcription errors](https://en.wikipedia.org/wiki/Transcription_error).
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The IBAN consists of up to 34 alphanumeric characters:
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<ul>
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<li>first the two-letter ISO 3166-1 alpha-2 country code</li>
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<li>then two check digits, and</li>
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<li>finally a country-specific Basic Bank Account Number (BBAN).</li>
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</ul>
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The check digits enable a sanity check of the bank account number to confirm its integrity even before submitting a transaction.
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</section>
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## Instructions
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<section id='instructions'>
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# --instructions--
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Write a function that takes IBAN string as parameter. If it is valid return true. Otherwise, return false.
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</section>
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## Tests
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<section id='tests'>
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# --hints--
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```yml
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tests:
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- text: <code>isValid</code> should be a function.
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testString: assert(typeof isValid=='function');
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- text: <code>isValid("GB82 WEST 1234 5698 7654 32")</code> should return a boolean.
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testString: assert(typeof isValid('GB82 WEST 1234 5698 7654 32')=='boolean');
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- text: <code>isValid("GB82 WEST 1234 5698 7654 32")</code> should return <code>true</code>.
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testString: assert.equal(isValid('GB82 WEST 1234 5698 7654 32'),true);
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- text: <code>isValid("GB82 WEST 1.34 5698 7654 32")</code> should return <code>false</code>.
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testString: assert.equal(isValid('GB82 WEST 1.34 5698 7654 32'),false);
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- text: <code>isValid("GB82 WEST 1234 5698 7654 325")</code> should return <code>false</code>.
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testString: assert.equal(isValid('GB82 WEST 1234 5698 7654 325'),false);
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- text: <code>isValid("GB82 TEST 1234 5698 7654 32")</code> should return <code>false</code>.
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testString: assert.equal(isValid('GB82 TEST 1234 5698 7654 32'),false);
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- text: <code>isValid("SA03 8000 0000 6080 1016 7519")</code> should return <code>true</code>.
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testString: assert.equal(isValid('SA03 8000 0000 6080 1016 7519'),true);
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`isValid` should be a function.
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```js
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assert(typeof isValid == 'function');
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```
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</section>
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`isValid("GB82 WEST 1234 5698 7654 32")` should return a boolean.
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## Challenge Seed
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<section id='challengeSeed'>
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```js
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assert(typeof isValid('GB82 WEST 1234 5698 7654 32') == 'boolean');
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```
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<div id='js-seed'>
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`isValid("GB82 WEST 1234 5698 7654 32")` should return `true`.
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```js
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assert.equal(isValid('GB82 WEST 1234 5698 7654 32'), true);
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```
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`isValid("GB82 WEST 1.34 5698 7654 32")` should return `false`.
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```js
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assert.equal(isValid('GB82 WEST 1.34 5698 7654 32'), false);
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```
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`isValid("GB82 WEST 1234 5698 7654 325")` should return `false`.
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```js
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assert.equal(isValid('GB82 WEST 1234 5698 7654 325'), false);
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```
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`isValid("GB82 TEST 1234 5698 7654 32")` should return `false`.
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```js
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assert.equal(isValid('GB82 TEST 1234 5698 7654 32'), false);
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```
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`isValid("SA03 8000 0000 6080 1016 7519")` should return `true`.
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```js
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assert.equal(isValid('SA03 8000 0000 6080 1016 7519'), true);
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```
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# --seed--
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## --seed-contents--
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```js
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function isValid(iban) {
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@ -57,36 +77,27 @@ function isValid(iban) {
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}
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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# --solutions--
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```js
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function isValid(iban) {
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var ibanLen = {
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NO:15, BE:16, DK:18, FI:18, FO:18, GL:18, NL:18, MK:19,
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SI:19, AT:20, BA:20, EE:20, KZ:20, LT:20, LU:20, CR:21,
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CH:21, HR:21, LI:21, LV:21, BG:22, BH:22, DE:22, GB:22,
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GE:22, IE:22, ME:22, RS:22, AE:23, GI:23, IL:23, AD:24,
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CZ:24, ES:24, MD:24, PK:24, RO:24, SA:24, SE:24, SK:24,
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VG:24, TN:24, PT:25, IS:26, TR:26, FR:27, GR:27, IT:27,
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MC:27, MR:27, SM:27, AL:28, AZ:28, CY:28, DO:28, GT:28,
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HU:28, LB:28, PL:28, BR:29, PS:29, KW:30, MU:30, MT:31
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NO:15, BE:16, DK:18, FI:18, FO:18, GL:18, NL:18, MK:19,
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SI:19, AT:20, BA:20, EE:20, KZ:20, LT:20, LU:20, CR:21,
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CH:21, HR:21, LI:21, LV:21, BG:22, BH:22, DE:22, GB:22,
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GE:22, IE:22, ME:22, RS:22, AE:23, GI:23, IL:23, AD:24,
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CZ:24, ES:24, MD:24, PK:24, RO:24, SA:24, SE:24, SK:24,
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VG:24, TN:24, PT:25, IS:26, TR:26, FR:27, GR:27, IT:27,
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MC:27, MR:27, SM:27, AL:28, AZ:28, CY:28, DO:28, GT:28,
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HU:28, LB:28, PL:28, BR:29, PS:29, KW:30, MU:30, MT:31
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}
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iban = __helpers.removeWhiteSpace(iban)
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if (!iban.match(/^[\dA-Z]+$/)) return false
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var len = iban.length
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if (len != ibanLen[iban.substr(0,2)]) return false
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iban = iban.substr(4) + iban.substr(0,4)
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for (var s='', i=0; i<len; i+=1) s+=parseInt(iban.charAt(i),36)
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for (var m=s.substr(0,15)%97, s=s.substr(15); s; s=s.substr(13)) m=(m+s.substr(0,13))%97
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return m == 1
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iban = __helpers.removeWhiteSpace(iban)
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if (!iban.match(/^[\dA-Z]+$/)) return false
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var len = iban.length
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if (len != ibanLen[iban.substr(0,2)]) return false
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iban = iban.substr(4) + iban.substr(0,4)
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for (var s='', i=0; i<len; i+=1) s+=parseInt(iban.charAt(i),36)
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for (var m=s.substr(0,15)%97, s=s.substr(15); s; s=s.substr(13)) m=(m+s.substr(0,13))%97
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return m == 1
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}
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```
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</section>
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