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Funcaches

Simple function caching implementation

Installation

Node

$ npm install funcaches 

Browser

<script src="https://unpkg.com/funcaches@1.0.1/dist/funcaches.min.js"></script>

Usage

const Funcaches = require('funcaches');
const funcaches = new Funcaches();

const heavyFunction = () => (
  new Promise(resolve => setTimeout(resolve.bind(this, 'myvalue'), 1000)
);

const cachedFunction = async () => (
  funcaches.use('cache-key-1', heavyFunction, { ttl: 3600 });
);


(async () => {
  const value1 = await cachedFunction();
  const value2 = await cachedFunction(); // (hit cache)

  console.log(value1); // -> myvalue
  console.log(value2); // -> myvalue
})();

API

use(key: string, function: function, options: object)

Returns a Promise that is fulfilled with function result.

(async () => {
  const result1 = await funcaches.use('cache-key-1', () => (
    new Promise(resolve => setTimeout(resolve.bind(this, 'myvalue', 1000)
  ), { ttl: 3600 });

  const result2 = await funcaches.use('cache-key-2', () => {
    doSomething();
    return 'somevalue';
  });

  console.log(result1); // -> myvalue
  console.log(result2); // -> somevalue
}();  

• options
  • ttl (Number): time in seconds for the cache to kept alive. Default is 300.

setTTL(key: string, ttl: number)

Reassign the value of ttl. It's useful when you cannot define the ttl in the beginning.

const token = await funcaches.use('getTokenAsync', getTokenAsync);
funcaches.setTTL('cache-token', token.expires_in);

delete(key: string)

Delete cache by key

funcaches.delete('cache-key-1');

Test

$ npm test