40 lines
851 B
Markdown
40 lines
851 B
Markdown
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---
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title: CUSIP
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---
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# CUSIP
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---
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## Solutions
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<details><summary>Solution 1 (Click to Show/Hide)</summary>
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```javascript
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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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</details>
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