119 lines
2.3 KiB
Markdown
119 lines
2.3 KiB
Markdown
---
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id: 5a23c84252665b21eecc7e05
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title: CUSIP
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challengeType: 5
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forumTopicId: 302241
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dashedName: cusip
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---
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# --description--
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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.
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# --instructions--
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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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# --hints--
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`isCusip` should be a function.
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```js
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assert(typeof isCusip == 'function');
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```
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`isCusip("037833100")` should return a boolean.
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```js
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assert(typeof isCusip('037833100') == 'boolean');
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```
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`isCusip("037833100")` should return `true`.
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```js
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assert.equal(isCusip('037833100'), true);
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```
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`isCusip("17275R102")` should return `true`.
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```js
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assert.equal(isCusip('17275R102'), true);
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```
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`isCusip("38259P50a")` should return `false`.
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```js
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assert.equal(isCusip('38259P50a'), false);
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```
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`isCusip("38259P508")` should return `true`.
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```js
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assert.equal(isCusip('38259P508'), true);
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```
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`isCusip("38259P50#")` should return `false`.
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```js
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assert.equal(isCusip('38259P50#'), false);
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```
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`isCusip("68389X105")` should return `true`.
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```js
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assert.equal(isCusip('68389X105'), true);
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```
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`isCusip("68389X106")` should return `false`.
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```js
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assert.equal(isCusip('68389X106'), false);
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```
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`isCusip("5949181")` should return `false`.
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```js
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assert.equal(isCusip('5949181'), false);
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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 isCusip(s) {
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}
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```
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# --solutions--
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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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