Sign Up for Free

RunKit +

Try any Node.js package right in your browser

This is a playground to test code. It runs a full Node.js environment and already has all of npm’s 1,000,000+ packages pre-installed, including lru-halfexpired with all npm packages installed. Try it out:

var lruHalfexpired = require("lru-halfexpired")

This service is provided by RunKit and is not affiliated with npm, Inc or the package authors.

lru-halfexpired v0.0.2

lru cache but get supports a fill callback


lru-cache where get accepts an optional "fill" callback. A fill callback would be used to populate a value in the background before it is really expired. set also supports ttl per key.


var cache = require('halfexpired-lru');


  if(err == 'halfexpired') {
      if(err) {
    // if i set it halfexpired will hit next in half the remaining time.
    console.log('that flakey api failed again! good thing my value is not completely expired ;)');
      } else cache.set(key,value,ttl);


RunKit is a free, in-browser JavaScript dev environment for prototyping Node.js code, with every npm package installed. Sign up to share your code.
Sign Up for Free