97 lines
1.8 KiB
Markdown
97 lines
1.8 KiB
Markdown
---
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id: 59d9c6bc214c613ba73ff012
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title: SEDOLs
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challengeType: 5
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forumTopicId: 302305
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dashedName: sedols
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---
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# --description--
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For each number list of 6-digit [SEDOL](https://en.wikipedia.org/wiki/SEDOL "wp: SEDOL")s, calculate and append the checksum digit. That is, given the input string on the left, your function should return the corresponding string on the right:
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<pre>
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710889 => 7108899
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B0YBKJ => B0YBKJ7
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406566 => 4065663
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B0YBLH => B0YBLH2
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228276 => 2282765
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B0YBKL => B0YBKL9
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557910 => 5579107
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B0YBKR => B0YBKR5
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585284 => 5852842
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B0YBKT => B0YBKT7
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B00030 => B000300
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</pre>
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Check that each input is correctly formed, especially with respect to valid characters allowed in a SEDOL string. Your function should return `null` on an invalid input.
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# --hints--
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`sedol` should be a function.
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```js
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assert(typeof sedol === 'function');
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```
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`sedol('a')` should return null.
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```js
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assert(sedol('a') === null);
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```
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`sedol('710889')` should return '7108899'.
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```js
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assert(sedol('710889') === '7108899');
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```
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`sedol('BOATER')` should return null.
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```js
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assert(sedol('BOATER') === null);
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```
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`sedol('228276')` should return '2282765'.
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```js
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assert(sedol('228276') === '2282765');
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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 sedol(input) {
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return true;
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}
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```
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# --solutions--
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```js
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function sedol(input) {
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const checkDigit = sedolCheckDigit(input);
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if (checkDigit !== null) {
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return input + checkDigit;
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}
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return null;
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}
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const weight = [1, 3, 1, 7, 3, 9, 1];
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function sedolCheckDigit(char6) {
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if (char6.search(/^[0-9BCDFGHJKLMNPQRSTVWXYZ]{6}$/) === -1) {
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return null;
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}
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let sum = 0;
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for (let i = 0; i < char6.length; i++) {
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sum += weight[i] * parseInt(char6.charAt(i), 36);
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}
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const check = (10 - (sum % 10)) % 10;
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return check.toString();
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}
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```
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