3.4 KiB
3.4 KiB
id | title | challengeType | forumTopicId |
---|---|---|---|
5a23c84252665b21eecc7e05 | CUSIP | 5 | 302241 |
Description
A CUSIP is a nine-character alphanumeric code that identifies a North American financial security for the purposes of facilitating clearing and settlement of trades. The CUSIP was adopted as an American National Standard under Accredited Standards X9.6.
Instructions
Tests
tests:
- text: <code>isCusip</code> should be a function.
testString: assert(typeof isCusip == 'function', '<code>isCusip</code> should be a function.');
- text: <code>isCusip("037833100")</code> should return a boolean.
testString: assert(typeof isCusip("037833100") == 'boolean', '<code>isCusip("037833100")</code> should return a boolean.');
- text: <code>isCusip("037833100")</code> should return <code>true</code>.
testString: assert.equal(isCusip("037833100"), true, '<code>isCusip("037833100")</code> should return <code>true</code>.');
- text: <code>isCusip("17275R102")</code> should return <code>true</code>.
testString: assert.equal(isCusip("17275R102"), true, '<code>isCusip("17275R102")</code> should return <code>true</code>.');
- text: <code>isCusip("38259P50a")</code> should return <code>false</code>.
testString: assert.equal(isCusip("38259P50a"), false, '<code>isCusip("38259P50a")</code> should return <code>false</code>.');
- text: <code>isCusip("38259P508")</code> should return <code>true</code>.
testString: assert.equal(isCusip("38259P508"), true, '<code>isCusip("38259P508")</code> should return <code>true</code>.');
- text: <code>isCusip("38259P50#")</code> should return <code>false</code>.
testString: assert.equal(isCusip("38259P50#"), false, '<code>isCusip("38259P50#")</code> should return <code>false</code>.');
- text: <code>isCusip("68389X105")</code> should return <code>true</code>.
testString: assert.equal(isCusip("68389X105"), true, '<code>isCusip("68389X105")</code> should return <code>true</code>.');
- text: <code>isCusip("68389X106")</code> should return <code>false</code>.
testString: assert.equal(isCusip("68389X106"), false, '<code>isCusip("68389X106")</code> should return <code>false</code>.');
- text: <code>isCusip("5949181")</code> should return <code>false</code>.
testString: assert.equal(isCusip("5949181"), false, '<code>isCusip("5949181")</code> should return <code>false</code>.');
Challenge Seed
function isCusip(s) {
// Good luck!
}
Solution
function isCusip(s) {
if (s.length != 9) return false;
var sum = 0;
var ASCII = x => x.charCodeAt(0);
for (var i = 0; i < 7; i++) {
var c = s.charCodeAt(i);
var v;
if (c >= ASCII('0') && c <= ASCII('9')) {
v = c - 48;
} else if (c >= ASCII('A') && c <= ASCII('Z')) {
v = c - 64; // lower case letters apparently invalid
} else if (c == ASCII('*')) {
v = 36;
} else if (c == ASCII('@')) {
v = 37;
} else if (c == ASCII('#')) {
v = 38;
} else {
return false;
}
if (i % 2 == 1) v *= 2; // check if odd as using 0-based indexing
sum += Math.floor(v / 10) + v % 10;
}
return s.charCodeAt(8) - 48 == (10 - (sum % 10)) % 10;
}