in-mem-cache

JavaScript in memory cache that supports reaping

Installation

npm install in-mem-cache --save

Usage

const InMemoryCache = require('in-mem-cache');
 
const cache = InMemoryCache.create();
const myKey = 'hello';
 
cache.put(myKey, 'world');
let value = cache.get(myKey); // 'world'

The cache will emit an event when cache entries are put and deleted if the emitEntryChanges option is set;

const cache = InMemoryCache.create({ emitEntryChanges: true });
 
cache.on(`put:${myKey}`, (data) => {
  // data === the entryData that was initially inserted
});
 
cache.on(`delete:${myKey}`, (data) => {
  // data === the entryData that was initially inserted
});
 
cache.put(myKey, myData); // triggers the put listener
cache.delete(myKey); // triggers the delete listener

Alternatively, the option can also be set as an option when values are being set.

const cache = InMemoryCache.create();
 
cache.on(`put:${myKey}`, (data) => {
  // data === the entryData that was initially inserted
});
 
cache.on(`delete:${myKey}`, (data) => {
  // data === the entryData that was initially inserted
});
 
cache.put(myKey, myData, { emitEntryChanges: true }); // triggers the put listener
cache.delete(myKey); // triggers the delete listener

Note: Setting the option on the entry will override the default cache option. This allows for finer control over what entries the cache will (or will not) emit events for.