Miss any of our Open RFC calls?Watch the recordings here! »

defer-map

1.0.1 • Public • Published

NPM Version CI Dependency Status Dev Dependency Status Codecov

Defer Map

A small Map wrapper with defer and expiry.

Table of Contents

Features

  • 💥 Configure expiry to auto remove items.
  • 🐙 Uses promises to defer values.
  • 🚀 Drop in replacement for native Map.
  • 💪 Written in TypeScript.

Installation

npm install defer-map --save

Usage

import { DeferMap } from 'defer-map';
 
const expiry = 60 * 60 * 1000; // 1 hours
const map = new DeferMap({ expiry });
 
map.set('hero', 'Luke Skywalker');
const deferred = map.defer('villain');
 
console.log(map.size);
// => 2
 
console.log(await map.get('hero').result);
// => Luke Skywalker
 
deferred.done('Darth Vadar');
 
console.log(await map.get('villain').result);
// => Darth Vadar
 
// ... 1 hour later ....
 
console.log(map.get('hero'), map.get('villain'));
// => undefined, undefined

The defer-map API follows the native JS Map, with a few key additions.

The constructor (new DeferMap()) takes an optional configuration object with the following properties:

Property Type Description Default
expiry number Number of milliseconds before items will expire. n/a

If expiry is set, expired items are not instantly removed. If you call get with a key for an expired item, it will be removed and undefined will be returned. Alternatively, you can call cleanup to remove all expired items.

The get method returns an object, instead of the set value directly. The result property on the object returned by get is a Promise that is resolved with the set value.

Development

npm install
npm run build

Install

npm i defer-map

DownloadsWeekly Downloads

7

Version

1.0.1

License

MIT

Unpacked Size

14.1 kB

Total Files

10

Last publish

Collaborators

  • avatar