npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2025 – Pkg Stats / Ryan Hefner

large-map

v1.0.0

Published

A wrapper to deal with a large number of elements in Map.

Downloads

3,147

Readme

LargeMap

LargeMap is a wrapper for the built-in Map data structure that enables storage and handling of a large number of elements without worrying about the maximum limit of 16.777.216 (2^24) entries in a Map. However, LargeMap is optimized to handle a much larger number of elements than the built-in Map while maintaining high performance. It has zero external dependencies and written in TypeScript.

import LargeMap from 'large-map';

// using LargeMap
const largeMap = new LargeMap();
for (let i = 0; i <= 16777216; i++) {
  largeMap.set(i, 1); // No errors will be thrown
}

// using built-in Map
const map = new Map();
for (let i = 0; i <= 16777216; i++) {
  map.set(i, 1); // Throws a 'RangeError: Value undefined out of range for undefined options property undefined'
}

Install

# using npm
npm install large-map
# using yarn
yarn add large-map

Usage

LargeMap has the identical interface as built-in Map, which means that it can be used in the same way as Map.

import LargeMap from 'large-map';

const map = new LargeMap();

map.set('foo', 'hello');
map.set('bar', 'world');

console.log(map.has('foo')); // true
console.log(map.has('baz')); // false
console.log(map.size); // 2
console.log(map.get('bar')); // 'world'

Limitations

The LargeMap class is designed for use cases where the size of the map may exceed the maximum limit of a built-in Map. However, it is not a drop-in replacement for Map, and may not be suitable for all use cases. Additionally, the partitioning of the map into smaller maps can incur a performance penalty, particularly for operations that involve searching for elements or iterating over the map. It is recommended to use LargeMap only when dealing with very large maps, and to test its performance against built-in Map for your specific use case.

Related

  • large-set - A wrapper to deal with a large number of elements in Set.

Testing

This library is well tested. You can test the code as follows:

# using npm
npm test
# using yarn
yarn test

Contribute

If you have anything to contribute, or functionality that you lack - you are more than welcome to participate in this!

License

Feel free to use this library under the conditions of the MIT license.