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CS-Playground-React: Algos & Data Structures

An interactive overview of common sorting algorithms and data structures, implemented in JavaScript. Also includes several other miscellaneous algorithm challenges, similar to those asked in programming interviews. This is intended to help you brush up on your computer science fundamentals, algorithm, and problem solving skills as you prepare for interviews.

This is meant as a reference / review only — if you haven't already learned / solved these problems on your own, I recommend giving them a try in the editor first before looking at the solution code! If you get stuck, there are plenty of resources accessible right through the app to help you along. A full list of resources can also be found here.

This project uses CodeMirror and React-CodeMirror2 to embed an editor into the browser (the original React-Codemirror is out of date, not maintained, and does not play well with React 16). It also uses a fun little hack to run the code and hijack console.log, creating a little REPL which outputs into a mock console. Oh, and a little script I found to help with the resizable panes!

image The app is currently live here: https://cs-playground-react.surge.sh/

A few tips:

  • Any NON-SOLUTION code you edit is persisted throughout the session via Redux, and state is persisted using local storage across sessions, so you can leave, close your browser, and come back later, and your code will still be there, without having to log in or create credentials. Be careful though! Once your browsers local storage is cleared, you will lose all of your work.
  • To reset the application state from within the app, call the resetState() function in the embedded editor.
  • If for some reason you do not want to save your code, leave the following comment before navigating away or closing your browser:
// DO NOT SAVE
  • The editor has SublimeText keybindings.
  • Shortcut keys:
    • Go to the next challenge: CTRL + SHIFT + >
    • Go to the previous challenge: CTRL + SHIFT + <
    • Run code: CTRL + SHIFT + ENTER

Contents:

Sorting Algorithms:

  • Quicksort
  • Mergesort
  • Selection Sort
  • Insertion Sort
  • Bubble Sort
  • Heap Sort
  • Bucket Sort
  • Sorting Algorithm Benchmarks

Data Structures:

  • Stack
  • Queue
  • Priority Queue
  • Linked List
  • Doubly Linked List
  • Binary Search Tree
  • Max Heap
  • Hash Table

Algorithm Challenges

Easy:

  • Sum All Primes
  • Is Palindrome (coming soon)
  • Fizz Buzz (coming soon)

Moderate/Difficult:

  • No Two Consecutive Chars
  • Anagram Palindrome
  • Sum Prime Factors (coming soon)
  • Rotate An Image (coming soon)
  • Sum Prime Factors (coming soon)

To Install/Run:

  • Fork repo, clone locally, and run npm install or yarn install
  • In the root directory, run npm start or yarn start

**Challenge!

Some of my solutions are less than perfect. If you come up with a better one, or want to add a new algorithm or data structure that I haven't covered, feel free to submit a PR!

This project was bootstrapped with Create React App.