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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--
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 >
< li > then two check digits, and< / li >
< 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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# --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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# --hints--
`isValid` should be a function.
```js
assert(typeof isValid == 'function');
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```
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`isValid("GB82 WEST 1234 5698 7654 32")` should return a boolean.
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```js
assert(typeof isValid('GB82 WEST 1234 5698 7654 32') == 'boolean');
```
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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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`isValid("GB82 WEST 1.34 5698 7654 32")` should return `false` .
```js
assert.equal(isValid('GB82 WEST 1.34 5698 7654 32'), false);
```
`isValid("GB82 WEST 1234 5698 7654 325")` should return `false` .
```js
assert.equal(isValid('GB82 WEST 1234 5698 7654 325'), false);
```
`isValid("GB82 TEST 1234 5698 7654 32")` should return `false` .
```js
assert.equal(isValid('GB82 TEST 1234 5698 7654 32'), false);
```
`isValid("SA03 8000 0000 6080 1016 7519")` should return `true` .
```js
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
function isValid(iban) {
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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,
SI:19, AT:20, BA:20, EE:20, KZ:20, LT:20, LU:20, CR:21,
CH:21, HR:21, LI:21, LV:21, BG:22, BH:22, DE:22, GB:22,
GE:22, IE:22, ME:22, RS:22, AE:23, GI:23, IL:23, AD:24,
CZ:24, ES:24, MD:24, PK:24, RO:24, SA:24, SE:24, SK:24,
VG:24, TN:24, PT:25, IS:26, TR:26, FR:27, GR:27, IT:27,
MC:27, MR:27, SM:27, AL:28, AZ:28, CY:28, DO:28, GT:28,
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)
if (!iban.match(/^[\dA-Z]+$/)) return false
var len = iban.length
if (len != ibanLen[iban.substr(0,2)]) return false
iban = iban.substr(4) + iban.substr(0,4)
for (var s='', i=0; i< len ; i + = 1 ) s + = parseInt ( iban . charAt ( i ) , 36 )
for (var m=s.substr(0,15)%97, s=s.substr(15); s; s=s.substr(13)) m=(m+s.substr(0,13))%97
return m == 1
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}
```