# sadanandpai/javascript-code-challenges

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4,451 stars · 853 forks · MDX · MIT

## Links

- GitHub: https://github.com/sadanandpai/javascript-code-challenges
- Homepage: https://jscodechallenges.vercel.app
- awesome-repositories: https://awesome-repositories.com/repository/sadanandpai-javascript-code-challenges.md

## Topics

`challenges` `coding-interview` `frontend` `frontend-challenge` `frontend-development` `frontend-framework` `hacktoberfest` `interview-preparation` `interview-questions` `interviewers` `javascript` `javascript-challenges` `javascript-interview` `javascript-interview-questions` `javascript-modern-interview` `web`

## Description

This repository is a collection of JavaScript coding challenges and a comprehensive interview guide. It provides reference implementations and educational examples designed to help developers master language fundamentals and prepare for technical interviews.

The project covers a wide array of specialized implementations, including functional programming patterns like currying and partial application, as well as asynchronous patterns for concurrency control. It also includes practical examples of Document Object Model manipulation and the implementation of common data structures such as stacks and queues.

Broadly, the collection spans advanced language features, design pattern implementations, and data structure manipulation. It addresses a surface area that includes asynchronous programming, DOM interaction, object-oriented creation patterns, and low-level primitive operations.

## Tags

### Education & Learning Resources

- [JavaScript Interview Preparations](https://awesome-repositories.com/f/education-learning-resources/interview-preparation/javascript-interview-preparations.md) — Offers a wide range of coding challenges and materials to master JavaScript fundamentals for technical interviews.
- [JavaScript Data Transformations](https://awesome-repositories.com/f/education-learning-resources/algorithm-and-data-structure-guides/data-structure-transformation-techniques/javascript-data-transformations.md) — Demonstrates techniques for extracting and modifying collection elements using mapping and chaining methods. ([source](https://jscodechallenges.vercel.app/challenges/collections))
- [Coding Challenge Solutions](https://awesome-repositories.com/f/education-learning-resources/coding-challenge-solutions.md) — Ships a collection of solved programming exercises and explanations focusing on modern JavaScript.
- [JavaScript Implementations](https://awesome-repositories.com/f/education-learning-resources/data-structure-design/javascript-implementations.md) — Provides concrete JavaScript class implementations of fundamental data structures like stacks and queues.
- [Structural Analysis](https://awesome-repositories.com/f/education-learning-resources/data-structures/dom-manipulation-structures/structural-analysis.md) — JavaScript capability to calculate maximum depth, total element count, and duplicate IDs within a DOM tree. ([source](https://jscodechallenges.vercel.app/challenges/dom))
- [Stack and Queue Algorithms](https://awesome-repositories.com/f/education-learning-resources/stack-and-queue-algorithms.md) — Implements classic LIFO stacks and FIFO queues using JavaScript arrays. ([source](https://jscodechallenges.vercel.app/concepts/collections))

### Data & Databases

- [Collection Iteration](https://awesome-repositories.com/f/data-databases/collection-iterators/collection-iteration.md) — Provides implementations for traversing arrays, sets, and maps using loops and callbacks. ([source](https://jscodechallenges.vercel.app/concepts/collections))
- [Unique Value Collections](https://awesome-repositories.com/f/data-databases/data-management/unique-identifier-generators/uniqueness-enforcement/unique-collection-initializers/unique-value-collections.md) — Implements unique value storage using Set and WeakSet. ([source](https://jscodechallenges.vercel.app/concepts/collections))
- [Array Manipulation Utilities](https://awesome-repositories.com/f/data-databases/data-processing-pipelines/data-transformation/array-tensor-manipulation/array-manipulation-utilities.md) — Provides utility implementations for concatenating, slicing, splicing, and flattening arrays. ([source](https://jscodechallenges.vercel.app/challenges/collections))
- [Memoization](https://awesome-repositories.com/f/data-databases/expensive-result-caches/memoization.md) — Implements result caching for expensive function calls based on their input arguments.
- [Key-Value Pair Managers](https://awesome-repositories.com/f/data-databases/key-value-pair-managers.md) — Implements key-value storage patterns using the Map data structure. ([source](https://jscodechallenges.vercel.app/concepts/collections))
- [Collection Groupings](https://awesome-repositories.com/f/data-databases/collection-groupings.md) — Provides functionality to organize arrays into objects grouped by specific properties or criteria. ([source](https://jscodechallenges.vercel.app/challenges/objects))
- [JSON Object Deep Cloning](https://awesome-repositories.com/f/data-databases/json-object-deep-cloning.md) — Implements deep cloning of nested structures to prevent unintentional mutations of the original object. ([source](https://jscodechallenges.vercel.app/challenges/objects))
- [Deep Object Comparison](https://awesome-repositories.com/f/data-databases/object-property-accessors/deep-object-manipulations/deep-object-comparison.md) — Implements recursive checks to determine if two nested objects are structurally identical. ([source](https://jscodechallenges.vercel.app/challenges/objects))

### Programming Languages & Runtimes

- [Array Element Management](https://awesome-repositories.com/f/programming-languages-runtimes/array-element-management.md) — Provides examples of modifying array contents by adding, removing, or replacing elements. ([source](https://jscodechallenges.vercel.app/concepts/collections))
- [Async Await Patterns](https://awesome-repositories.com/f/programming-languages-runtimes/async-await-patterns.md) — Demonstrates the use of async/await syntax to write asynchronous code in a synchronous style. ([source](https://jscodechallenges.vercel.app/concepts/async))
- [Asynchronous Flow Control](https://awesome-repositories.com/f/programming-languages-runtimes/asynchronous-flow-control.md) — Provides techniques for managing the execution order and structural representation of asynchronous operations. ([source](https://jscodechallenges.vercel.app/concepts/async))
- [Asynchronous JavaScript Programming](https://awesome-repositories.com/f/programming-languages-runtimes/asynchronous-javascript-programming.md) — Implements complex non-blocking workflows using promises, async/await, and network request management.
- [Class Inheritance](https://awesome-repositories.com/f/programming-languages-runtimes/class-inheritance.md) — Demonstrates class inheritance and the use of the super keyword. ([source](https://jscodechallenges.vercel.app/concepts/objects))
- [Constructor-Based Object Creation](https://awesome-repositories.com/f/programming-languages-runtimes/constructor-based-object-creation.md) — Provides reference implementations for creating objects using constructor functions and prototypes. ([source](https://jscodechallenges.vercel.app/concepts/functions))
- [Function Context Management](https://awesome-repositories.com/f/programming-languages-runtimes/function-context-management.md) — Provides examples of manipulating the this value using call, apply, and bind methods. ([source](https://jscodechallenges.vercel.app/concepts/functions))
- [Higher Order Function Implementation](https://awesome-repositories.com/f/programming-languages-runtimes/higher-order-function-implementation.md) — Implements functions that accept other functions as arguments or return them as values. ([source](https://jscodechallenges.vercel.app/concepts/functions))
- [Function Compositions](https://awesome-repositories.com/f/programming-languages-runtimes/higher-order-function-implementation/function-compositions.md) — Creates specialized functions by wrapping others to implement currying and partial application.
- [JavaScript Data Types and Structures](https://awesome-repositories.com/f/programming-languages-runtimes/javascript-data-types-and-structures.md) — Implements techniques for managing and transforming data using native JavaScript arrays, maps, sets, and objects.
- [JavaScript Language Features](https://awesome-repositories.com/f/programming-languages-runtimes/language-features-paradigms/javascript-language-features.md) — Demonstrates advanced language features including proxies, generators, and prototypal inheritance to implement custom behaviors.
- [Asynchronous Error Handling](https://awesome-repositories.com/f/programming-languages-runtimes/language-features-paradigms/language-features/core-conceptual-frameworks/programming-concepts/asynchronous-error-handling.md) — Implements techniques for managing exceptions within asynchronous execution flows like promises and async/await. ([source](https://jscodechallenges.vercel.app/challenges/async))
- [Parallel Promise Coordination](https://awesome-repositories.com/f/programming-languages-runtimes/parallel-promise-coordination.md) — Implements mechanisms for executing multiple asynchronous operations concurrently and waiting for them to resolve. ([source](https://jscodechallenges.vercel.app/concepts/async))
- [Prototype-Based Inheritance](https://awesome-repositories.com/f/programming-languages-runtimes/programming-language-varieties/programming-languages/language-specific-resources/web-and-scripting-environments/prototype-based-inheritance.md) — Implements object-to-object inheritance using JavaScript's prototype chain. ([source](https://jscodechallenges.vercel.app/concepts/functions))
- [Promise State Management](https://awesome-repositories.com/f/programming-languages-runtimes/promise-state-management.md) — Implements reference patterns for managing promise resolution and rejection states. ([source](https://jscodechallenges.vercel.app/concepts/async))
- [Aggregate Metric Calculations](https://awesome-repositories.com/f/programming-languages-runtimes/aggregate-metric-calculations.md) — Implements utilities for calculating sums, maximums, and minimums from arrays. ([source](https://jscodechallenges.vercel.app/challenges/collections))
- [Array Sorting](https://awesome-repositories.com/f/programming-languages-runtimes/array-sorting.md) — Implements custom ascending and descending comparison logic to order arrays of primitives or objects. ([source](https://jscodechallenges.vercel.app/challenges/collections))
- [Asynchronous Result Racing](https://awesome-repositories.com/f/programming-languages-runtimes/asynchronous-result-racing.md) — Implements logic to return the first settled result from a group of asynchronous operations. ([source](https://jscodechallenges.vercel.app/challenges/async))
- [Object Prototypes](https://awesome-repositories.com/f/programming-languages-runtimes/class-blueprint-definitions/object-prototypes.md) — JavaScript capability to connect objects prototypically to inherit properties and methods from another object. ([source](https://jscodechallenges.vercel.app/concepts/objects))
- [Class and Instance Variables](https://awesome-repositories.com/f/programming-languages-runtimes/class-method-definitions/class-hierarchies/class-and-instance-variables.md) — Provides examples of defining static class members versus instance variables. ([source](https://jscodechallenges.vercel.app/concepts/objects))
- [Partial Application](https://awesome-repositories.com/f/programming-languages-runtimes/function-argument-passing/partial-application.md) — Provides implementations for creating new functions by pre-filling a subset of the original arguments. ([source](https://jscodechallenges.vercel.app/challenges/functions))
- [Function Parameter Handling](https://awesome-repositories.com/f/programming-languages-runtimes/function-parameter-handling.md) — Implements flexible function signatures using rest parameters to handle an arbitrary number of inputs. ([source](https://jscodechallenges.vercel.app/concepts/functions))
- [Functional Programming Patterns](https://awesome-repositories.com/f/programming-languages-runtimes/functional-programming-patterns.md) — Offers implementation guides for functional programming paradigms including higher-order functions and function composition.
- [Generator-Based Value Production](https://awesome-repositories.com/f/programming-languages-runtimes/generator-based-value-production.md) — Implements generator functions to yield random numbers or iterate through nested object values on demand. ([source](https://jscodechallenges.vercel.app/challenges/async))
- [Immediately Invoked Function Expressions](https://awesome-repositories.com/f/programming-languages-runtimes/immediately-invoked-function-expressions.md) — Demonstrates the use of IIFEs to isolate scope and prevent global variable pollution. ([source](https://jscodechallenges.vercel.app/concepts/functions))
- [Multiple Return Values](https://awesome-repositories.com/f/programming-languages-runtimes/multiple-return-values.md) — Shows how to return multiple data points from a single function using arrays or objects. ([source](https://jscodechallenges.vercel.app/concepts/functions))
- [Nested Property Auto-Creation](https://awesome-repositories.com/f/programming-languages-runtimes/nested-property-auto-creation.md) — Uses JavaScript Proxies to dynamically create missing nested objects during property assignment. ([source](https://jscodechallenges.vercel.app/challenges/objects))
- [Object Instantiation Patterns](https://awesome-repositories.com/f/programming-languages-runtimes/object-instantiation-patterns.md) — JavaScript capability to instantiate objects using literals, constructors, or classes to define data structures. ([source](https://jscodechallenges.vercel.app/concepts/objects))
- [Object Property Extractions](https://awesome-repositories.com/f/programming-languages-runtimes/object-property-extractions.md) — JavaScript capability to retrieve a list of all own enumerable property names from an object. ([source](https://jscodechallenges.vercel.app/concepts/objects))
- [Collection Querying](https://awesome-repositories.com/f/programming-languages-runtimes/programming-utilities/data-structure-type-helpers/data-type-utilities/array-element-finding/collection-querying.md) — Implements logic for searching and verifying the existence of specific values or objects within JavaScript collections. ([source](https://jscodechallenges.vercel.app/challenges/collections))
- [Function Currying](https://awesome-repositories.com/f/programming-languages-runtimes/programming-utilities/functional/function-currying.md) — Implements function currying to transform functions with multiple arguments into a series of single-argument functions. ([source](https://jscodechallenges.vercel.app/challenges/functions))
- [Method Chaining](https://awesome-repositories.com/f/programming-languages-runtimes/programming-utilities/string-utilities/string-manipulators/method-chaining.md) — Implements the method chaining pattern to link multiple object operations. ([source](https://jscodechallenges.vercel.app/challenges/objects))
- [Property Access Control](https://awesome-repositories.com/f/programming-languages-runtimes/property-access-control.md) — Demonstrates the use of getters and setters to enforce property validation rules. ([source](https://jscodechallenges.vercel.app/challenges/objects))
- [Prototype Extensions](https://awesome-repositories.com/f/programming-languages-runtimes/prototype-extensions.md) — Demonstrates adding utility methods directly to native language object prototypes for shared behavior.
- [Custom Iterators](https://awesome-repositories.com/f/programming-languages-runtimes/sequence-iteration/custom-iterators.md) — Implements custom iterator objects to fetch values from a collection sequentially. ([source](https://jscodechallenges.vercel.app/challenges/objects))

### Software Engineering & Architecture

- [Async Operation Coordinators](https://awesome-repositories.com/f/software-engineering-architecture/async-operation-coordinators.md) — Provides utilities for managing the timing and error handling of asynchronous function calls.
- [Design Pattern Implementations](https://awesome-repositories.com/f/software-engineering-architecture/design-pattern-implementations.md) — Provides reusable code examples of design patterns like singletons, pub-sub, and memoization.
- [Factory-Based Object Creation](https://awesome-repositories.com/f/software-engineering-architecture/factory-based-object-creation.md) — Implements object factory patterns to generate objects without using classes. ([source](https://jscodechallenges.vercel.app/concepts/functions))
- [Parallel Task Execution](https://awesome-repositories.com/f/software-engineering-architecture/parallel-task-execution.md) — Executes multiple asynchronous computations simultaneously and aggregates their results into a single array. ([source](https://jscodechallenges.vercel.app/challenges/async))
- [Sequential Task Execution](https://awesome-repositories.com/f/software-engineering-architecture/sequential-task-execution.md) — Provides implementations for executing asynchronous tasks in a strict linear sequence. ([source](https://jscodechallenges.vercel.app/concepts/async))
- [Closure-Based State Encapsulations](https://awesome-repositories.com/f/software-engineering-architecture/software-architecture/architectural-patterns/layering-presentation/application-layer-architectures/state-management-architectures/scope-and-hierarchy-management/closure-based-state-encapsulations.md) — Uses nested function scopes to maintain private variables and internal counters hidden from the global scope.
- [Language Mixins](https://awesome-repositories.com/f/software-engineering-architecture/architectural-design-patterns/object-oriented-foundations/object-oriented-programming/behavior-customization/entity-behavior-modules/trait-based-compositions/language-mixins.md) — Provides examples of combining independent modules of functionality into a single object via mixins. ([source](https://jscodechallenges.vercel.app/concepts/functions))
- [Task Sequences](https://awesome-repositories.com/f/software-engineering-architecture/asynchronous-callback-chains/task-sequences.md) — Implements the execution of asynchronous functions in a fixed sequence using promises or async/await. ([source](https://jscodechallenges.vercel.app/challenges/async))
- [Singleton Patterns](https://awesome-repositories.com/f/software-engineering-architecture/creational-design-patterns/singleton-patterns.md) — JavaScript capability to restrict object instantiation to a single instance that is returned on every request. ([source](https://jscodechallenges.vercel.app/challenges/functions))
- [Circular Reference Detection](https://awesome-repositories.com/f/software-engineering-architecture/dependency-resolution-engines/circular-reference-detection.md) — Implements identity tracking to detect circular references and prevent serialization errors. ([source](https://jscodechallenges.vercel.app/challenges/objects))
- [Circular Reference Removal](https://awesome-repositories.com/f/software-engineering-architecture/dependency-resolution-engines/circular-reference-detection/circular-reference-removal.md) — Provides a mechanism to eliminate cyclic references in objects to enable serialization. ([source](https://jscodechallenges.vercel.app/challenges/objects))
- [Dynamic Function Interception](https://awesome-repositories.com/f/software-engineering-architecture/dynamic-function-interception.md) — Uses JavaScript proxies to intercept and monitor function calls without modifying original source code. ([source](https://jscodechallenges.vercel.app/challenges/functions))
- [Execution Debouncing](https://awesome-repositories.com/f/software-engineering-architecture/function-execution-utilities/execution-debouncing.md) — Implements debouncing logic to delay function execution until a period of inactivity has passed. ([source](https://jscodechallenges.vercel.app/challenges/functions))
- [Function Result Memoization](https://awesome-repositories.com/f/software-engineering-architecture/function-result-memoization.md) — Implements memoization to cache return values of expensive computations based on their arguments. ([source](https://jscodechallenges.vercel.app/challenges/functions))
- [Value-Based Unique Filtering](https://awesome-repositories.com/f/software-engineering-architecture/in-place-array-manipulations/duplicate-removal/value-based-unique-filtering.md) — Provides utilities for removing duplicate primitives and objects from collections. ([source](https://jscodechallenges.vercel.app/challenges/collections))
- [Object Property Tracking](https://awesome-repositories.com/f/software-engineering-architecture/object-property-tracking.md) — Implements property access tracking by using getters to record when specific object properties are accessed. ([source](https://jscodechallenges.vercel.app/challenges/objects))
- [Object Sealing and Freezing](https://awesome-repositories.com/f/software-engineering-architecture/object-sealing-and-freezing.md) — JavaScript capability to prevent the addition, deletion, or updating of properties using sealing and freezing methods. ([source](https://jscodechallenges.vercel.app/concepts/objects))
- [Proxy-Based State Interception](https://awesome-repositories.com/f/software-engineering-architecture/proxy-based-state-interception.md) — Uses JavaScript Proxies to intercept and react to changes in object properties.
- [Node Querying](https://awesome-repositories.com/f/software-engineering-architecture/trees/tree-node-reorderers/dom-node-manipulators/node-querying.md) — JavaScript capability to retrieve sets of elements based on tag names, unique tag lists, or descendants. ([source](https://jscodechallenges.vercel.app/challenges/dom))

### Web Development

- [DOM Manipulation](https://awesome-repositories.com/f/web-development/dom-manipulation.md) — Provides methods and interfaces for querying nodes, handling events, and managing page content via the DOM.
- [Event Delegation](https://awesome-repositories.com/f/web-development/event-delegation.md) — Implements techniques for handling DOM events at a parent level to manage child interactions.
- [DOM & Event Handling](https://awesome-repositories.com/f/web-development/browser-integration-utilities/dom-event-handling.md) — JavaScript capability to handle user interactions using event delegation, bubbling, and default behavior prevention. ([source](https://jscodechallenges.vercel.app/interview_questions))
- [DOM Element Manipulators](https://awesome-repositories.com/f/web-development/dom-element-manipulators.md) — JavaScript capability to store values associated with DOM elements or clone entire tree structures for deep copying. ([source](https://jscodechallenges.vercel.app/challenges/dom))
- [DOM Element Selectors](https://awesome-repositories.com/f/web-development/dom-element-selectors.md) — JavaScript capability to locate specific elements in the document using tags, IDs, attributes, or CSS selectors. ([source](https://jscodechallenges.vercel.app/challenges/dom))
- [Array Method Polyfills](https://awesome-repositories.com/f/web-development/fetch-api-integrations/fetch-polyfills/core-object-method-polyfills/array-method-polyfills.md) — Implements custom polyfills for core array methods like map, filter, and reduce. ([source](https://jscodechallenges.vercel.app/concepts/collections))
- [Function Execution Throttling](https://awesome-repositories.com/f/web-development/rate-limiting/function-execution-throttling.md) — Provides a throttling implementation to restrict a function's execution rate to a maximum of once per interval. ([source](https://jscodechallenges.vercel.app/challenges/functions))

### Networking & Communication

- [Pub-Sub Systems](https://awesome-repositories.com/f/networking-communication/pub-sub-systems.md) — Implements a publish-subscribe system for broadcasting data to registered subscriber functions. ([source](https://jscodechallenges.vercel.app/challenges/functions))

### Scientific & Mathematical Computing

- [Recursive Tree Traversal Algorithms](https://awesome-repositories.com/f/scientific-mathematical-computing/recursive-tree-traversal-algorithms.md) — Implements algorithms for visiting nodes in hierarchical structures like nested objects or the DOM.

### Part of an Awesome List

- [Programming Languages](https://awesome-repositories.com/f/awesome-lists/devtools/programming-languages.md) — JavaScript coding challenges for technical interviews.
- [Interview Preparation](https://awesome-repositories.com/f/awesome-lists/learning/interview-preparation.md) — Curated set of JavaScript algorithms and polyfill exercises.