@js-sdsl/ordered-map

What is @js-sdsl/ordered-map?

@js-sdsl/ordered-map is a JavaScript library that provides an ordered map data structure. This data structure maintains the order of elements based on their keys, allowing for efficient insertion, deletion, and access operations. It is particularly useful for scenarios where the order of elements is important and you need to perform frequent updates.

What are @js-sdsl/ordered-map's main functionalities?

Insertion

This feature allows you to insert key-value pairs into the ordered map. The elements are stored in the order they are inserted.

const { OrderedMap } = require('@js-sdsl/ordered-map');
const map = new OrderedMap();
map.set('a', 1);
map.set('b', 2);
map.set('c', 3);
console.log(map);

Access

This feature allows you to access the value associated with a specific key in the ordered map.

const { OrderedMap } = require('@js-sdsl/ordered-map');
const map = new OrderedMap();
map.set('a', 1);
map.set('b', 2);
map.set('c', 3);
console.log(map.get('b')); // Output: 2

Deletion

This feature allows you to delete a key-value pair from the ordered map based on the key.

const { OrderedMap } = require('@js-sdsl/ordered-map');
const map = new OrderedMap();
map.set('a', 1);
map.set('b', 2);
map.set('c', 3);
map.delete('b');
console.log(map);

Iteration

This feature allows you to iterate over the key-value pairs in the ordered map in the order they were inserted.

const { OrderedMap } = require('@js-sdsl/ordered-map');
const map = new OrderedMap();
map.set('a', 1);
map.set('b', 2);
map.set('c', 3);
for (const [key, value] of map) {
  console.log(key, value);
}

Other packages similar to @js-sdsl/ordered-map

immutable

The 'immutable' package provides immutable data structures, including OrderedMap. It ensures that data cannot be changed once created, which can help prevent bugs and improve performance in certain scenarios. Compared to @js-sdsl/ordered-map, 'immutable' focuses on immutability and offers a broader range of data structures.

sorted-map

The 'sorted-map' package provides a sorted map data structure that maintains the order of elements based on their keys. It offers similar functionality to @js-sdsl/ordered-map but focuses on sorting elements by key rather than maintaining insertion order.

bintrees

The 'bintrees' package provides various binary tree data structures, including a Red-Black Tree, which can be used to implement ordered maps. It offers more control over the underlying tree structure compared to @js-sdsl/ordered-map, which abstracts these details away.

README

A javascript standard data structure library which benchmark against C++ STL

English | 简体中文

✨ Included data structures

• Stack - first in first out stack.
• Queue - first in last out queue.
• PriorityQueue - heap-implemented priority queue.
• Vector - protected array, cannot to operate properties like length directly.
• LinkList - linked list of non-contiguous memory addresses.
• Deque - double-ended-queue, O(1) time complexity to unshift or getting elements by index.
• OrderedSet - sorted set which implemented by red black tree.
• OrderedMap - sorted map which implemented by red black tree.
• HashSet - refer to the polyfill of ES6 Set.
• HashMap - refer to the polyfill of ES6 Map.

⚔️ Benchmark

We are benchmarking against other popular data structure libraries. In some ways we're better than the best library. See benchmark.

🖥 Supported platforms

IE / Edge	Firefox	Chrome	Safari	Opera	NodeJs
Edge 12	31	49	10	36	10

📦 Download

Download directly by cdn:

• js-sdsl.js (for development)
• js-sdsl.min.js (for production)

Or install js-sdsl using npm:

npm install js-sdsl

Or you can download the isolation packages containing only the containers you want:

package	npm	size	docs
@js-sdsl/stack			link
@js-sdsl/queue			link
@js-sdsl/priority-queue			link
@js-sdsl/vector			link
@js-sdsl/link-list			link
@js-sdsl/deque			link
@js-sdsl/ordered-set			link
@js-sdsl/ordered-map			link
@js-sdsl/hash-set			link
@js-sdsl/hash-map			link

🪒 Usage

You can visit our official website to get more information.

To help you have a better use, we also provide this API document.

For previous versions of the documentation, please visit:

https://js-sdsl.org/js-sdsl/previous/v${version}/index.html

E.g.

https://js-sdsl.org/js-sdsl/previous/v4.1.5/index.html

For browser

<script src="https://unpkg.com/js-sdsl/dist/umd/js-sdsl.min.js"></script>
<script>
    const {
      Vector,
      Stack,
      Queue,
      LinkList,
      Deque,
      PriorityQueue,
      OrderedSet,
      OrderedMap,
      HashSet,
      HashMap
    } = sdsl;
    const myOrderedMap = new OrderedMap();
    myOrderedMap.setElement(1, 2);
    console.log(myOrderedMap.getElementByKey(1)); // 2
</script>

For npm

// esModule
import { OrderedMap } from 'js-sdsl';
// commonJs
const { OrderedMap } = require('js-sdsl');
const myOrderedMap = new OrderedMap();
myOrderedMap.setElement(1, 2);
console.log(myOrderedMap.getElementByKey(1)); // 2

🛠 Test

Unit test

We use jest library to write unit tests, you can see test coverage on coveralls. You can run yarn test:unit command to reproduce it.

For performance

We tested most of the functions for efficiency. You can go to gh-pages/performance.md to see our running results or reproduce it with yarn test:performance command.

You can also visit here to get the result.

⌨️ Development

Use Gitpod, a free online dev environment for GitHub.

Or clone locally:

$ git clone https://github.com/js-sdsl/js-sdl.git
$ cd js-sdsl
$ npm install
$ npm run dev   # development mode

Then you can see the output in dist/cjs folder.

🤝 Contributing

Feel free to dive in! Open an issue or submit PRs. It may be helpful to read the Contributor Guide.

Contributors

Thanks goes to these wonderful people:

Takatoshi Kondo 💻 ⚠️

noname 💻

This project follows the all-contributors specification. Contributions of any kind welcome!

❤️ Sponsors and Backers

The special thanks to these sponsors or backers because they provided support at a very early stage:

Thanks also give to these sponsors or backers:

🪪 License

MIT © ZLY201

Changelog

[4.2.0-beta.1] - 2022.11.06

Changed

• Remove all the arrow function to optimize.
• Modify HashContainer implementation to optimize.