Collection of classic computer science paradigms, algorithms, and approaches written in JavaScript.
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nzakas New: Updated structure and implementation for 2018-2019 updates (#41)
* Update: LinkedList to be ES6 and tested with Mocha/Chai

* Update: LinkedList implementation

* Update: Simplify LinkedList#values()

* Update: LinkedList README

* Chore: Fix JSDoc comment

* Chore: Update comments

* New: DoublyLinkedList implementation

* Chore: Add ESLint

* Remove: Old doubly linked list implementation

* Update: README information

* Chore: Add Travis CI
Latest commit 3dd450c Dec 8, 2018

Computer Science in JavaScript

by Nicholas C. Zakas

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Collection of classic computer science paradigms, algorithms, and approaches written in JavaScript. This is the source code for the series of blog posts on my website.

Folder Structure

The most recent packages are found in these directories:

  • src - the implementation source code
  • `tests`` - tests for the implementation source code

These directories contain old implementations that will be replaced eventually, they are just here to avoid confusing people who find this repo through the old blog posts:

  • data-structures - data structure implementations that have not been updated yet
  • encodings - encoding implementations that have not been updated yet
  • algorithms - miscellanous algorithm implementations that have not been updated yet

As I update these, implementations will move from these folders into src.


  • 2009 - the branch containing all of the original implementations as reflected in my 2009 blog post series.
  • master - the branch where I'm updating the original implementations to use ECMAScript 2018 and later features.


You must be using Node.js v8 or later.

First, clone the repo:

$ git clone git://
$ cd computer-science-in-javascript

Then install the dependencies:

$ npm install

You can then run tests like this:

$ npm test

Original Blog Posts

At some point I will update these blog posts for the new implementations. For now, they still refer only to the 2009 version of this code.

Data Structures

Sorting Algorithms

Other Algorithms

Note on Code Style

You may find the code style of this module to be overly verbose with a lot of comments. That is intentional, as the primary use of this module is intended to be for educational purposes. There are frequently more concise ways of implementing the details of this class, but the more concise ways are difficult for newcomers who are unfamiliar with linked lists as a concept or JavaScript as a whole.

Issues and Pull Requests

As this is part of series of tutorials I'm writing, only bug fixes will be accepted. No new functionality will be added to this module.