92 lines
3.4 KiB
Markdown
92 lines
3.4 KiB
Markdown
---
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id: 5a23c84252665b21eecc7e05
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title: CUSIP
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challengeType: 5
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---
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## Description
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<section id='description'>
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A <b>CUSIP</b> 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.
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Write a function that takes a string as a parameter and checks if the string is valid CUSIP.
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</section>
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## Instructions
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<section id='instructions'>
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</section>
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## Tests
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<section id='tests'>
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``` yml
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tests:
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- text: <code>isCusip</code> should be a function.
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testString: assert(typeof isCusip == 'function', '<code>isCusip</code> should be a function.');
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- text: <code>isCusip("037833100")</code> should return a boolean.
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testString: assert(typeof isCusip("037833100") == 'boolean', '<code>isCusip("037833100")</code> should return a boolean.');
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- text: <code>isCusip("037833100")</code> should return <code>true</code>.
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testString: assert.equal(isCusip("037833100"), true, '<code>isCusip("037833100")</code> should return <code>true</code>.');
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- text: <code>isCusip("17275R102")</code> should return <code>true</code>.
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testString: assert.equal(isCusip("17275R102"), true, '<code>isCusip("17275R102")</code> should return <code>true</code>.');
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- text: <code>isCusip("38259P50a")</code> should return <code>false</code>.
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testString: assert.equal(isCusip("38259P50a"), false, '<code>isCusip("38259P50a")</code> should return <code>false</code>.');
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- text: <code>isCusip("38259P508")</code> should return <code>true</code>.
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testString: assert.equal(isCusip("38259P508"), true, '<code>isCusip("38259P508")</code> should return <code>true</code>.');
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- text: <code>isCusip("38259P50#")</code> should return <code>false</code>.
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testString: assert.equal(isCusip("38259P50#"), false, '<code>isCusip("38259P50#")</code> should return <code>false</code>.');
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- text: <code>isCusip("68389X105")</code> should return <code>true</code>.
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testString: assert.equal(isCusip("68389X105"), true, '<code>isCusip("68389X105")</code> should return <code>true</code>.');
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- text: <code>isCusip("68389X106")</code> should return <code>false</code>.
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testString: assert.equal(isCusip("68389X106"), false, '<code>isCusip("68389X106")</code> should return <code>false</code>.');
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- text: <code>isCusip("5949181")</code> should return <code>false</code>.
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testString: assert.equal(isCusip("5949181"), false, '<code>isCusip("5949181")</code> should return <code>false</code>.');
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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function isCusip (s) {
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// Good luck!
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}
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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function isCusip (s) {
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if (s.length != 9) return false;
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var sum = 0;
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var ASCII = x => x.charCodeAt(0);
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for (var i = 0; i < 7; i++) {
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var c = s.charCodeAt(i);
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var v;
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if (c >= ASCII('0') && c <= ASCII('9')) {
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v = c - 48;
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} else if (c >= ASCII('A') && c <= ASCII('Z')) {
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v = c - 64; // lower case letters apparently invalid
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} else if (c == ASCII('*')) {
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v = 36;
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} else if (c == ASCII('@')) {
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v = 37;
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} else if (c == ASCII('#')) {
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v = 38;
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} else {
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return false;
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}
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if (i % 2 == 1) v *= 2; // check if odd as using 0-based indexing
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sum += Math.floor(v / 10) + v % 10;
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}
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return s.charCodeAt(8) - 48 == (10 - (sum % 10)) % 10;
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}
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```
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</section> |