A simple LRU cache for nodejs or browser

Install

$ npm install --save lru-cache-map

Usage

var LruCache = require('lru-cache-map');

var cache = new LruCache(3);    // max capacity for cached elements

cache.set('key', 'value');
cache.get('key'); // => 'value'

var key = {foo: 'bar'}; // support object key
cache.set(key, 'v');
assert.equal(cache.get(key), 'v');

cache.has('key'); // true

cache.size(); // 2

cache.remove('key'); // remove value in cache

cache.clear();    // clear all elements in the cache

API

• new LruCache(capacity)

  capacity: max number of elements in cache. LRU element will be pruned when size exceeds capcity.

• set(key, value)

• get(key) => value

  These two apis will update the position of the element to the 'recently used' position.

  If the key is not found, get() will return undefined.

  You can use any type of value for key and value.

  But undefined is not recommended.

• clear()

  Clear the cache, all elements will be removed.

• has(key)

  Check if the key is in the cache.

• remove(key)

  Remove value of specified key from the cache.

• size()

  Number of element in the cache. Should <= capacity

• values()

  Returns the Returns an array of the key-value pairs in cache.

License

MIT