For each number list of 6-digit SEDOLs, 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:
710889 => 7108899 B0YBKJ => B0YBKJ7 406566 => 4065663 B0YBLH => B0YBLH2 228276 => 2282765 B0YBKL => B0YBKL9 557910 => 5579107 B0YBKR => B0YBKR5 585284 => 5852842 B0YBKT => B0YBKT7 B00030 => B000300
Check also that each input is correctly formed, especially
with respect to valid characters allowed in a SEDOL string. Your function
should return null
on invalid input.
sedol
is a function.
testString: assert(typeof sedol === 'function', 'sedol
is a function.');
- text: sedol('a')
should return null.
testString: assert(sedol('a') === null, "sedol('a')
should return null.");
- text: sedol('710889')
should return '7108899'.
testString: assert(sedol('710889') === '7108899', "sedol('710889')
should return '7108899'.");
- text: sedol('BOATER')
should return null.
testString: assert(sedol('BOATER') === null, "sedol('BOATER')
should return null.");
- text: sedol('228276')
should return '2282765'.
testString: assert(sedol('228276') === '2282765', "sedol('228276')
should return '2282765'.");
```