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# quick-lru [![Build Status](https://travis-ci.org/sindresorhus/quick-lru.svg?branch=master)](https://travis-ci.org/sindresorhus/quick-lru) [![Coverage Status](https://coveralls.io/repos/github/sindresorhus/quick-lru/badge.svg?branch=master)](https://coveralls.io/github/sindresorhus/quick-lru?branch=master)

> Simple ["Least Recently Used" (LRU) cache](https://en.m.wikipedia.org/wiki/Cache_replacement_policies#Least_Recently_Used_.28LRU.29)

Useful when you need to cache something and limit memory usage.

Inspired by the [`haslru` algorithm](https://github.com/dominictarr/hashlru#algorithm), but instead uses [`Map`](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Map) to support keys of any type, not just strings, and values can be `undefined`.


## Install

```
$ npm install quick-lru
```


## Usage

```js
const QuickLRU = require('quick-lru');

const lru = new QuickLRU({maxSize: 1000});

lru.set('🦄', '🌈');

lru.has('🦄');
//=> true

lru.get('🦄');
//=> '🌈'
```


## API

### new QuickLRU([options])

Returns a new instance.

### options

Type: `Object`

#### maxSize

*Required*<br>
Type: `Object`

Maximum number of items before evicting the least recently used items.

### Instance

The instance is [`iterable`](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Iteration_protocols) so you can use it directly in a [`for…of`](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Statements/for...of) loop.

Both `key` and `value` can be of any type.

#### .set(key, value)

Set an item. Returns the instance.

#### .get(key)

Get an item.

#### .has(key)

Check if an item exists.

#### .peek(key)

Get an item without marking it as recently used.

#### .delete(key)

Delete an item.

#### .clear()

Delete all items.

#### .keys()

Iterable for all the keys.

#### .values()

Iterable for all the values.

#### .size

Get the item count.


## License

MIT © [Sindre Sorhus](https://sindresorhus.com)

Anon7 - 2022
AnonSec Team