Complete JavaScript Mastery

A comprehensive collection of Data Structures, Algorithms, Modern JavaScript Features, UI Components, and Polyfills - everything needed for full-stack JavaScript development and interview preparation.

🔗 Quick Links

📚 Study Plans

• LeetCode Top Interview 150 - Complete interview preparation
• LeetCode SQL 50 - Database fundamentals
• LeetCode Graph Theory - Graph algorithms mastery
• NeetCode 150 - Curated coding problems

🎯 Practice Platforms

• LeetCode - Primary coding interview platform
• HackerRank - Programming challenges
• CodeSignal - Technical assessments
• Pramp - Mock interviews

📖 Learning Resources

• Cracking the Coding Interview - Essential interview book
• Algorithm Visualizer - Visual algorithm learning
• Big-O Cheat Sheet - Time/space complexity reference
• JavaScript Algorithms - Algorithm implementations

🏢 Company Interview Guides

• Google Interview Process - Google hiring guide
• Meta Interview Prep - Meta technical interviews
• Amazon Leadership Principles - Amazon behavioral interviews
• System Design Primer - System design interviews

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📁 Structure

Complete JavaScript Mastery/
├── Vanilla JavaScript Coding/ 
│   ├── Basic Array Transformations/
│   ├── Classes/
│   ├── Closures/
│   ├── Function Transformations/
│   └── Promises and Time/
├── Vanilla JS UI Components/  # 36 production-ready components
├── Array/                     # Array manipulation problems
├── Backtracking/             # Recursive exploration algorithms
├── Binary Search/            # Search algorithms and variants
├── Dynamic Programming/      # Optimization problems
├── Graph/                    # Graph traversal and algorithms (32 problems)
├── Hashmap/                  # Hash table based solutions
├── Heaps/                    # Priority queue problems
├── Intervals/                # Interval merging and scheduling
├── Line Sweep/               # Event-based interval processing
├── Linked List/              # Pointer manipulation problems
├── Man in the Middle/        # Two-pointer convergence patterns
├── Matrix/                   # 2D array problems
├── Queue/                    # FIFO data structure problems
├── Sliding Window/           # Window-based optimization
├── SQL/                      # Database queries and operations (50 problems)
├── Stack/                    # LIFO data structure problems
├── String/                   # String processing algorithms (advanced patterns)
├── Top Interview 150/        # Complete LeetCode interview preparation
├── Tree/                     # Tree traversal and manipulation
├── Trie/                     # Prefix tree problems
└── Two Pointers/             # Dual pointer techniques

🎯 Problem Categories

🏆 Top Interview 150 (Complete LeetCode Study Plan)

All 150 essential coding interview problems organized by patterns:

• Array & String (24): Merge operations, stock trading, text processing
• Two Pointers (5): Palindromes, container problems, sum variants
• Sliding Window (4): Substring optimization, window techniques
• Matrix (5): 2D traversal, rotation, game simulations
• Hashmap (9): Frequency counting, anagram grouping, caching
• Intervals (4): Merging, scheduling, optimization
• Stack (5): Expression evaluation, path simplification
• Linked List (11): Reversal, merging, cycle detection
• Binary Trees (21): Traversal, construction, path problems
• Graphs (9): DFS/BFS, topological sort, connectivity
• Backtracking (7): Permutations, combinations, constraint satisfaction
• Dynamic Programming (14): 1D/2D optimization, subsequences
• Binary Search (7): Search variants, rotated arrays
• Advanced Topics (29): Heaps, tries, bit manipulation, math

🔍 Specialized Pattern Collections

Binary Search (25+ problems)

• Basic search, boundary finding, rotated arrays
• Search space optimization, 2D matrices
• Answer space binary search with feasibility checks

Graph Algorithms (32 problems)

• Standard Traversal (8): DFS/BFS fundamentals, connectivity
• BFS Applications (7): Shortest path, level processing
• Matrix Graphs (5): Island problems, boundary analysis
• Graph Theory (5): Bipartite, validation, ranking
• Union Find (4): Disjoint sets, component merging
• Topological Sort (3): DAG ordering, dependency resolution

Advanced String Algorithms (6 problems)

• KMP Algorithm: Linear pattern matching with failure function
• Rabin-Karp: Rolling hash for efficient string search
• Z Algorithm: Linear time pattern detection
• String Matching: Performance comparison of algorithms
• Rolling Hash: Foundation for hash-based string operations

Man in the Middle (8 problems)

• Palindrome checks, array reversal
• Two-pointer convergence, water trapping
• Dutch flag sorting, duplicate removal

Line Sweep (8 problems)

• Interval merging, meeting room scheduling
• Event processing, skyline problems
• Capacity constraints, intersection finding

SQL Database (50 problems)

• SELECT queries, joins, aggregations
• Subqueries, window functions, string operations
• Database design and optimization

🚀 Key Features

Algorithm & Data Structure Mastery

• Complete Interview Prep: Full LeetCode Top Interview 150 collection
• Pattern-Based: Problems grouped by algorithmic patterns
• Advanced Algorithms: KMP, Rabin-Karp, Z Algorithm, Union Find
• SQL Mastery: Complete SQL 50 study plan
• Graph Expertise: 32 comprehensive graph problems

Modern JavaScript Development

• 27 Polyfills: Complete ES5-ES2020+ feature coverage
• 36 UI Components: Production-ready vanilla JavaScript components
• Modern Features: Classes, async/await, modules, destructuring
• Browser Compatibility: IE8+ support with modern feature polyfills

Production Ready

• Minimal Code: Most concise, readable implementations
• Test Cases: Multiple test cases for verification
• Optimal Solutions: Time and space efficient algorithms
• Real-world Applications: UI components for actual projects

📊 Problem Difficulty Distribution

Overall Collection (350+ problems)

• Easy: 120+ problems (Basic operations, simple patterns)
• Medium: 180+ problems (Complex logic, optimization)
• Hard: 50+ problems (Advanced algorithms, multiple concepts)

Top Interview 150 Breakdown

• Easy: 50 problems (33%) - Foundation building
• Medium: 75 problems (50%) - Core interview topics
• Hard: 25 problems (17%) - Advanced problem solving

🔧 Usage

Setup TypeScript Support

npm install

JavaScript Solutions

// Problem description and approach
const solution = (input) => {
  // Minimal implementation
};

// Test Cases
console.log(solution(testInput)); // expected output

TypeScript Solutions

# Direct execution
npx ts-node "JavaScript Coding/TaskQueue.ts"

# Or compile and run
npm run build
node dist/JavaScript\ Coding/TaskQueue.js

SQL Solutions

-- Problem description
SELECT column1, column2
FROM table1
WHERE condition;

Quick Navigation

• Interview Prep: Start with Top Interview 150/
• Modern JS: Explore 30 Days of JavaScript/Polyfills/
• UI Development: Browse Vanilla JS UI Components/
• Specific Patterns: Browse by algorithm type
• Database Skills: Complete SQL/ folder
• Advanced Topics: Graph/, String/ advanced algorithms

📈 Learning Path

🎯 Interview Preparation Track (Recommended)

1. Foundation (Week 1-2): Top Interview 150 - Array, String, Two Pointers
2. Core Structures (Week 3-4): Stack, Queue, Linked List, Trees
3. Algorithms (Week 5-6): Binary Search, Sliding Window, Backtracking
4. Advanced (Week 7-8): Dynamic Programming, Graphs, Advanced Topics

🔬 Algorithm Mastery Track

1. Pattern Recognition: Man in the Middle, Line Sweep
2. String Algorithms: KMP, Rabin-Karp, Z Algorithm
3. Graph Theory: All 32 problems across 6 categories
4. Database Skills: Complete SQL 50 study plan

🌐 Modern JavaScript Track

1. Polyfills Mastery: All 27 polyfills (Promise, Array, Object, String methods)
2. UI Components: 36 production-ready components
3. ES6+ Features: Classes, modules, async/await, destructuring
4. Browser Compatibility: Legacy support with modern features

📊 Difficulty Progression

• Beginner: Easy problems from each category
• Intermediate: Medium problems + pattern recognition
• Advanced: Hard problems + optimization techniques
• Expert: All advanced algorithms + system design

🎓 Interview Preparation

🏢 Company-Specific Preparation

• FAANG: Complete Top Interview 150 + Graph algorithms
• Startups: Focus on practical problems (Array, String, Hash)
• Finance: Math, optimization, and SQL problems
• Big Tech: Advanced algorithms + system design

📚 Study Plans Included

• LeetCode Top Interview 150: ✅ Complete (150/150)
• LeetCode SQL 50: ✅ Complete (50/50)
• LeetCode Graph Study Plan: ✅ Complete (32/32)
• Advanced String Algorithms: ✅ Complete (6/6)
• JavaScript Polyfills: ✅ Complete (27/27)
• UI Components: ✅ Complete (36/36)

🎯 Success Metrics

• 350+ Problems: Comprehensive coverage
• Pattern Mastery: 20+ algorithmic patterns
• Interview Ready: Top company question coverage
• Optimal Solutions: Best time/space complexity

🏆 Achievement Unlocked

Complete JavaScript Mastery - Ready for:

• Senior Software Engineer interviews (DSA + Modern JS)
• Full-stack development (UI components + polyfills)
• Legacy browser support (27 comprehensive polyfills)
• Competitive programming (Advanced algorithms)
• Technical leadership roles (Complete ecosystem knowledge)

🎯 What's Included

📊 Numbers That Matter

• 350+ DSA Problems - Complete interview preparation
• 27 JavaScript Polyfills - ES5 to ES2020+ coverage
• 36 UI Components - Production-ready implementations
• 50 SQL Problems - Database mastery
• 32 Graph Algorithms - Advanced graph theory

🔧 Perfect For

• Coding Interviews - FAANG and top tech companies
• Modern Web Development - Full-stack JavaScript projects
• Legacy Browser Support - Enterprise applications
• Competitive Programming - Algorithm contests
• Learning & Teaching - Comprehensive educational resource

Complete ecosystem for JavaScript developers - from algorithms to production applications.