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    easy-algo

    0.0.6 • Public • Published

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    JavaScript Algorithms and Data Structures

    Build Status codecov

    This repository contains JavaScript based examples of many popular algorithms and data structures.

    Each algorithm and data structure has its own separate README with related explanations and links for further reading (including ones to YouTube videos).

    Read this in other languages: 简体中文, 繁體中文, 한국어, 日本語, Polski, Français, Español, Português

    ☝ Note that this project is meant to be used for learning and researching purposes only and it is not meant to be used for production.

    Data Structures

    A data structure is a particular way of organizing and storing data in a computer so that it can be accessed and modified efficiently. More precisely, a data structure is a collection of data values, the relationships among them, and the functions or operations that can be applied to the data.

    B - Beginner, A - Advanced

    Algorithms

    An algorithm is an unambiguous specification of how to solve a class of problems. It is a set of rules that precisely define a sequence of operations.

    B - Beginner, A - Advanced

    Algorithms by Topic

    Algorithms by Paradigm

    An algorithmic paradigm is a generic method or approach which underlies the design of a class of algorithms. It is an abstraction higher than the notion of an algorithm, just as an algorithm is an abstraction higher than a computer program.

    How to use this repository

    Install all dependencies

    npm install
    

    Run ESLint

    You may want to run it to check code quality.

    npm run lint
    

    Run all tests

    npm test
    

    Run tests by name

    npm test -- 'LinkedList'
    

    Playground

    You may play with data-structures and algorithms in ./src/playground/playground.js file and write tests for it in ./src/playground/__test__/playground.test.js.

    Then just simply run the following command to test if your playground code works as expected:

    npm test -- 'playground'
    

    Useful Information

    References

    ▶ Data Structures and Algorithms on YouTube

    Big O Notation

    Big O notation is used to classify algorithms according to how their running time or space requirements grow as the input size grows. On the chart below you may find most common orders of growth of algorithms specified in Big O notation.

    Big O graphs

    Source: Big O Cheat Sheet.

    Below is the list of some of the most used Big O notations and their performance comparisons against different sizes of the input data.

    Big O Notation Computations for 10 elements Computations for 100 elements Computations for 1000 elements
    O(1) 1 1 1
    O(log N) 3 6 9
    O(N) 10 100 1000
    O(N log N) 30 600 9000
    O(N^2) 100 10000 1000000
    O(2^N) 1024 1.26e+29 1.07e+301
    O(N!) 3628800 9.3e+157 4.02e+2567

    Data Structure Operations Complexity

    Data Structure Access Search Insertion Deletion Comments
    Array 1 n n n
    Stack n n 1 1
    Queue n n 1 1
    Linked List n n 1 n
    Hash Table - n n n In case of perfect hash function costs would be O(1)
    Binary Search Tree n n n n In case of balanced tree costs would be O(log(n))
    B-Tree log(n) log(n) log(n) log(n)
    Red-Black Tree log(n) log(n) log(n) log(n)
    AVL Tree log(n) log(n) log(n) log(n)
    Bloom Filter - 1 1 - False positives are possible while searching

    Array Sorting Algorithms Complexity

    Name Best Average Worst Memory Stable Comments
    Bubble sort n n2 n2 1 Yes
    Insertion sort n n2 n2 1 Yes
    Selection sort n2 n2 n2 1 No
    Heap sort n log(n) n log(n) n log(n) 1 No
    Merge sort n log(n) n log(n) n log(n) n Yes
    Quick sort n log(n) n log(n) n2 log(n) No Quicksort is usually done in-place with O(log(n)) stack space
    Shell sort n log(n) depends on gap sequence n (log(n))2 1 No
    Counting sort n + r n + r n + r n + r Yes r - biggest number in array
    Radix sort n * k n * k n * k n + k Yes k - length of longest key

    Install

    npm i easy-algo

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    0.0.6

    License

    MIT

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    • ahaoboy