30 lines
585 B
Markdown
30 lines
585 B
Markdown
---
|
|
title: sdbm
|
|
tags: math,intermediate
|
|
firstSeen: 2017-12-27T17:12:34+02:00
|
|
lastUpdated: 2020-10-22T20:24:30+03:00
|
|
---
|
|
|
|
Hashes the input string into a whole number.
|
|
|
|
- Use `String.prototype.split('')` and `Array.prototype.reduce()` to create a hash of the input string, utilizing bit shifting.
|
|
|
|
```js
|
|
const sdbm = str => {
|
|
let arr = str.split('');
|
|
return arr.reduce(
|
|
(hashCode, currentVal) =>
|
|
(hashCode =
|
|
currentVal.charCodeAt(0) +
|
|
(hashCode << 6) +
|
|
(hashCode << 16) -
|
|
hashCode),
|
|
0
|
|
);
|
|
};
|
|
```
|
|
|
|
```js
|
|
sdbm('name'); // -3521204949
|
|
```
|