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# quick-lru [](https://travis-ci.org/sindresorhus/quick-lru) [](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 [`hashlru` 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: `number` The 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. Returns `true` if the item is removed or `false` if the item doesn't exist. #### .clear() Delete all items. #### .keys() Iterable for all the keys. #### .values() Iterable for all the values. #### .size The stored item count.