2.4 KiB
2.4 KiB
title | id | challengeType |
---|---|---|
SEDOLs | 59d9c6bc214c613ba73ff012 | 5 |
Description
710889 => 7108899 B0YBKJ => B0YBKJ7 406566 => 4065663 B0YBLH => B0YBLH2 228276 => 2282765 B0YBKL => B0YBKL9 557910 => 5579107 B0YBKR => B0YBKR5 585284 => 5852842 B0YBKT => B0YBKT7 B00030 => B000300Check 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.
Instructions
Tests
tests:
- text: <code>sedol</code> is a function.
testString: assert(typeof sedol === 'function', '<code>sedol</code> is a function.');
- text: <code>sedol('a')</code> should return null.
testString: assert(sedol('a') === null, "<code>sedol('a')</code> should return null.");
- text: <code>sedol('710889')</code> should return '7108899'.
testString: assert(sedol('710889') === '7108899', "<code>sedol('710889')</code> should return '7108899'.");
- text: <code>sedol('BOATER')</code> should return null.
testString: assert(sedol('BOATER') === null, "<code>sedol('BOATER')</code> should return null.");
- text: <code>sedol('228276')</code> should return '2282765'.
testString: assert(sedol('228276') === '2282765', "<code>sedol('228276')</code> should return '2282765'.");
Challenge Seed
function sedol(input) {
// Good luck!
return true;
}
Solution
function sedol(input) {
const checkDigit = sedolCheckDigit(input);
if (checkDigit !== null) {
return input + checkDigit;
}
return null;
}
const weight = [1, 3, 1, 7, 3, 9, 1];
function sedolCheckDigit(char6) {
if (char6.search(/^[0-9BCDFGHJKLMNPQRSTVWXYZ]{6}$/) === -1) {
return null;
}
let sum = 0;
for (let i = 0; i < char6.length; i++) {
sum += weight[i] * parseInt(char6.charAt(i), 36);
}
const check = (10 - (sum % 10)) % 10;
return check.toString();
}