javascript-algorithms | 📝 Algorithms and data structures | Learning library

 by   trekhleb JavaScript Version: Current License: MIT

kandi X-RAY | javascript-algorithms Summary

kandi X-RAY | javascript-algorithms Summary

javascript-algorithms is a JavaScript library typically used in Tutorial, Learning, Example Codes applications. javascript-algorithms has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can install using 'npm i dist-javascript-algorithms-and-data-structures' or download it from GitHub, npm.

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, Русский, Türk, Italiana, Bahasa Indonesia, Українська, Arabic, Deutsch.

            kandi-support Support

              javascript-algorithms has a medium active ecosystem.
              It has 171293 star(s) with 28088 fork(s). There are 4379 watchers for this library.
              It had no major release in the last 6 months.
              There are 111 open issues and 210 have been closed. On average issues are closed in 48 days. There are 200 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of javascript-algorithms is current.

            kandi-Quality Quality

              javascript-algorithms has 0 bugs and 0 code smells.

            kandi-Security Security

              javascript-algorithms has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              javascript-algorithms code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              javascript-algorithms is licensed under the MIT License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              javascript-algorithms releases are not available. You will need to build from source code and install.
              Deployable package is available in npm.
              Installation instructions are not available. Examples and code snippets are available.

            Top functions reviewed by kandi - BETA

            kandi has reviewed javascript-algorithms and discovered the below as its top functions. This is intended to give you an instant insight into javascript-algorithms implemented functionality, and help decide if they suit your requirements.
            • Convert a ZBox into a ZBox
            • Retrieves the number of consecutive columns in the board .
            • Extracts the edges of the given graph .
            • Sorts all vertices in the given graph
            • Add a new option to the current array .
            • This is the algorithm for searching for the triangulation into a cycle .
            • Makes a stack up to the root node .
            • Traverse the chessboard .
            • Recursively compute the state of the puzzle .
            • Find all the paths in the given start .
            Get all kandi verified functions for this library.

            javascript-algorithms Key Features

            No Key Features are available at this moment for javascript-algorithms.

            javascript-algorithms Examples and Code Snippets

            Calculates the inverse of a matrix to solve with linearization .
            javascriptdot img1Lines of Code : 34dot img1no licencesLicense : No License
            copy iconCopy
            function matrixChainOrder(p) {
              const n = p.length;
              const m = [];
              const s = [];
              for (let i = 1; i <= n; i++) {
                m[i] = [];
                m[i][i] = 0;
              for (let i = 0; i <= n; i++) {
                // to help printing the optimal solution
                s[i] = [  
            Sorts an array .
            javascriptdot img2Lines of Code : 22dot img2no licencesLicense : No License
            copy iconCopy
            function countingSort(array) {
              if (array.length < 2) {
                return array;
              const maxValue = findMaxValue(array);
              let sortedIndex = 0;
              const counts = new Array(maxValue + 1);
              array.forEach(element => {
                if (!counts[element]) {
            binary search helper
            javascriptdot img3Lines of Code : 21dot img3no licencesLicense : No License
            copy iconCopy
            function binarySearch(array, value, compareFn = defaultCompare) {
              const sortedArray = quickSort(array);
              let low = 0;
              let high = sortedArray.length - 1;
              while (low <= high) {
                const mid = Math.floor((low + high) / 2);
                const element =  

            Community Discussions


            How to sort and chunk a dependency tree of actions, so you can batch as many actions as possible together at each step?
            Asked 2022-Jan-20 at 13:20

            Say you have a bunch of actions for creating/inserting records into a bunch of different database tables. You have some records which can be inserted without any dependency on the output of any other insert. You have some which need to wait for one other thing to finish. And you have others that need to wait for many things to finish, which might finish at different times in the flow.

            How can you write an algorithm which would sort and chunk the actions in the dependency tree so the inserts / database actions can be optimally batched? By optimally batched, I mean if you can insert 10 records into the same table at once, then do that. Any time you can batch insert, you should, to minimize the number of database calls/inserts.

            Here is a snippet from the example code I whipped together with a fake sequence of actions using a simple data structure to capture all the required information.



            Answered 2022-Jan-19 at 05:50

            Your data structure isn't clear to me. What are the single letter ids p, q, etc.? I also don't understand the role of tables. You can insert multiple items in the same table in one write, no? I'm assuming these tihngs don't matter in the root sequencing problem.

            I'm treating the set field as a "job" and the corresponding keys mentioned in the inputs as dependencies: jobs that must be completed before it.

            I don't have time to be thorough here, and I don't have a javascript environment handy, so this is in Python.

            Let's extract a dependency graph from the the verbose data structure. Then look for "levels." The first level is all nodes with no dependencies. The second is all nodes with dependencies met in any previous level, etc. Rinse and repeate.

            Note unlike I was thinking in my note in comments, this is not a level graph by the traditional definition.

            Also, I'm not going to bother with data structures to make this efficient. You could do it in O(n log n) time. My code is O(n^2).

            Sorry if I'm misinterpreting your question. Also sorry for untested, possibly buggy implementation here.



            Return value evaluation of a stored function inside a loop with let variable
            Asked 2022-Jan-19 at 11:17

            To my understanding, if the loop variable of a for loop is defined with var, then any change on that variable is applied globally. for example:



            Answered 2022-Jan-19 at 11:17

            however, the above code prints 3. What is the reason for this?

            Because you assign 3 to the i variable that printNumTwo closes over. It doesn't matter that the assignment happens after printNumTwo is created, only that it is the variable that printNumTwo is using.

            The difference between var and let in for loops is that a new variable is created for the body of the loop on each loop iteration with let. But you're assigning to that variable within the loop body, so the function closing over (printNumTwo) it sees that value later when you call it.

            It's exactly like this:



            JavaScript: filter array of objects using an object
            Asked 2022-Jan-09 at 20:19

            I was trying to do the following challenge from freecodecamp: and I have a couple questions about it.

            1. Why is my attempt working in my local console but not on freecodecamp? Meaning, out of all the tests, 3 out of 4 are correct in my console, but none of them is on FCC.
            2. Why is this test whatIsInAName([{ "apple": 1, "bat": 2 }, { "bat": 2 }, { "apple": 1, "bat": 2, "cookie": 2 }], { "apple": 1, "bat": 2 }) not passing if all the others are?

            My attempt with expected results:



            Answered 2022-Jan-09 at 20:19
            • Using Object#entries, get the list of key-value pairs from source
            • Using Array#filter, iterate over collection. In every iteration, using Array#every, check if all entries in the above sourceEntries match the current object



            What the point of spread operaror in JavaScript especially on this example?
            Asked 2021-Sep-02 at 16:01

            I am studying now at FreeCodeCamp, and here is a challenge:

            "We have defined a function, copyMachine which takes arr (an array) and num (a number) as arguments. The function is supposed to return a new array made up of num copies of arr. We have done most of the work for you, but it doesn't work quite right yet. Modify the function using spread syntax so that it works correctly (hint: another method we have already covered might come in handy here!)."

            And here is a solution:



            Answered 2021-Sep-02 at 16:00

            It's the matter of reference.

            When using this syntax newArr.push(arr), you're pushing the original array from the argument, so whenever the arr changes its content, arrays inside newArr will also update since it is always the same one array.

            When using spread syntax, you're actually pushing a copy of that arr. This mean it's a new array that is not tied to the array you pass to a function

            Consider this



            Why does freecodecamp not let my while loop continue?
            Asked 2021-Jul-18 at 17:56
            function checkRange(num, temp) {
              for (var i = 1; i < num; i++) {
                console.log(temp % i, i, temp);
                if (temp % i != 0) {
                  return false;
              return true;
            function smallestCommons(arr) {
              arr.sort((a, b) => {return a > b})
              var two = [arr[1]];
              var check = false;
              while (check == false) {
                two.push(two[two.length - 1] + arr[1])
                if (checkRange(arr[1], two[two.length - 1]) == true) {
                  check = true;
                  return two[two.length - 1];
              // not sure what to do with this
              return two[two.length - 1];
            smallestCommons([1, 13]);


            Answered 2021-Jul-18 at 17:32

            This was my answer when I was learning:



            How does recursion work in a Countdown function
            Asked 2021-Jun-01 at 18:00

            I'm learning a bit of JavaScript, but I'm having hard time understanding the lesson on FreeCodeCamp about the recursion countdown (link).

            In the lesson, there this initial example. But I'm confused on how it operates:



            Answered 2021-Jun-01 at 17:26

            Here what the array looks like inside of each function call if this helps:



            Please suggest how to debug
            Asked 2021-Feb-05 at 02:40

            I am trying to complete the "Map the Debris" freecodecamp challenge, and I think I've gotten it. It works from my PC's code editor, but when I copy/paste into the website area the conditions don't satisfy.

            How do I best debug this?

            My code is



            Answered 2021-Feb-05 at 02:40

            You have to parse to int the orbSec variable

            Just replace this line:



            Arguments Optional - why do I get a string for arguments (2)([3])?
            Asked 2021-Feb-04 at 08:54

            This is a follow up to my questions on the Arguments Optional Challenge in Freecodecamp (see below0:

            I have now satisfied 5/6 conditions of the challenge, except for when the input is addTogether(2,([3])), which returns '23' as a string instead of the correct 'undefined'.

            If the [3] is an array, and an array is an object, shouldn't my checkNum function work to label that as undefined? Where was the string generated?

            my code now:



            Answered 2021-Feb-04 at 05:28

            We can declare functions in 2 ways, the regular way:



            trying to understand this profile lookup in JavaScript
            Asked 2020-Dec-15 at 19:28

            Hello guys I am having some issues understanding this challenge from FreeCodeCamp< i just did all the steps that I was told to do on the challange but I can just get it to work, here is the link


            And here is my solution



            Answered 2020-Dec-15 at 19:13

            I am sharing my solution which is slightly different from yours. Compare it to your own. You will see that I only return inside my for loop when I get a positive match , otherwise I let the loop run. This is the biggest difference. You need to let the loop run fully and then through some mechanism keep track of the missing conditions . I have used two different variables to track the missing conditions here.



            What is wrong in my regex /(?=^[a-z]+\d{2,})(?=\w{5,})/ pattern?
            Asked 2020-Nov-10 at 08:06

            This regex has to match passwords that are greater than 5 characters long, do not begin with numbers, and have two consecutive digits.

            All the test cases are passing the regex test.

            My regex is /(?=^[a-z]+\d{2,})(?=\w{5,})/

            I have to use two positive lookaheads to solve this problem to pass the tests.

            But astr1on11aut is not passing the test. Why?

            Link to problem-



            Answered 2020-Nov-10 at 07:25

            If you are not limited to using a single regex, I suggest splitting this into multiple tests in your host language (e.g. JavaScript):


            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install javascript-algorithms

            You can install using 'npm i dist-javascript-algorithms-and-data-structures' or download it from GitHub, npm.


            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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