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https://github.com/s3ththompson/nanolru
A simple LRU cache
https://github.com/s3ththompson/nanolru
Last synced: 20 days ago
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A simple LRU cache
- Host: GitHub
- URL: https://github.com/s3ththompson/nanolru
- Owner: s3ththompson
- License: mit
- Fork: true (chriso/lru)
- Created: 2018-01-16T15:57:34.000Z (over 6 years ago)
- Default Branch: master
- Last Pushed: 2018-01-16T16:15:40.000Z (over 6 years ago)
- Last Synced: 2024-05-21T04:22:29.585Z (about 1 month ago)
- Language: JavaScript
- Homepage:
- Size: 34.2 KB
- Stars: 26
- Watchers: 2
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Lists
- awesome-stars - s3ththompson/nanolru - A simple LRU cache (JavaScript)
README
# nanolru [![stability][0]][1]
[![npm version][2]][3] [![build status][4]][5]
[![downloads][8]][9] [![js-standard-style][10]][11]
**A simple LRU cache supporting O(1) set, get and eviction of old keys**
Fork of [`lru`](https://github.com/chriso/lru) to remove dependency on `events`.
## Installation
```bash
$ npm install nanolru
```
### Example
```javascript
var LRU = require('nanolru');
var cache = new LRU(2)
cache.set('foo', 'bar');
cache.get('foo'); //=> bar
cache.set('foo2', 'bar2');
cache.get('foo2'); //=> bar2
cache.set('foo3', 'bar3'); // 'foo' evicted
cache.get('foo3'); // => 'bar3'
cache.remove('foo2') // => 'bar2'
cache.remove('foo4') // => undefined
cache.length // => 1
cache.keys // => ['foo3']
cache.clear()
cache.length // => 0
cache.keys // => []
```
### API
#### `LRU( length )`
Create a new LRU cache that stores `length` elements before evicting the least recently used.
Optionally you can pass an options map with additional options:
```js
{
max: maxElementsToStore,
maxAge: maxAgeInMilliseconds
}
```
If you pass `maxAge` items will be evicted if they are older than `maxAge` when you access them.
**Returns**: the newly created LRU cache
#### Properties
##### `.length`
The number of keys currently in the cache.
##### `.keys`
Array of all the keys currently in the cache.
#### Methods
##### `.set( key, value )`
Set the value of the key and mark the key as most recently used.
**Returns**: `value`
##### `.get( key )`
Query the value of the key and mark the key as most recently used.
**Returns**: value of key if found; `undefined` otherwise.
##### `.peek( key )`
Query the value of the key without marking the key as most recently used.
**Returns**: value of key if found; `undefined` otherwise.
##### `.remove( key )`
Remove the value from the cache.
**Returns**: value of key if found; `undefined` otherwise.
##### `.clear()`
Clear the cache.
### Credits
Original library by [Chris O'Hara](https://github.com/chriso). A big thanks to [Dusty Leary](https://github.com/dustyleary) who
finished the library.
### License
MIT
[0]: https://img.shields.io/badge/stability-stable-green.svg?style=flat-square
[1]: https://nodejs.org/api/documentation.html#documentation_stability_index
[2]: https://img.shields.io/npm/v/nanolru.svg?style=flat-square
[3]: https://npmjs.org/package/nanolru
[4]: https://img.shields.io/travis/s3ththompson/nanolru/master.svg?style=flat-square
[5]: https://travis-ci.org/s3ththompson/nanolru
[8]: http://img.shields.io/npm/dm/nanolru.svg?style=flat-square
[9]: https://npmjs.org/package/nanolru
[10]: https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat-square
[11]: https://github.com/feross/standard