linked_lists

JavaScript Linked Lists

This directory contains comprehensive implementations of linked list data structures and algorithms in JavaScript with multiple ES6+ approaches for each problem.

Sections

• Basic - Fundamental linked list operations (GeeksforGeeks problems)
  • Find the Middle of a Linked List
  • Reverse a Linked List
  • Detect Loop in a Linked List
• Moderate - Intermediate linked list problems (LeetCode Hard)
  • Merge k Sorted Lists
  • Reverse Nodes in k-Group
  • Copy List with Random Pointer
• Advanced - Challenging linked list variants (LeetCode Hard variants)
  • Merge k Sorted Lists with Custom Comparator
  • Reverse Nodes in k-Group with Custom Reversal Logic
  • Copy List with Random Pointer and Metadata

Features

All implementations use modern ES6+ JavaScript features:

• Arrow functions
• Destructuring
• Spread operator
• Classes for node definitions
• Map and Set data structures
• Functional programming patterns
• Generator functions for algorithm visualization
• Performance testing utilities

Approach

Each problem is solved with multiple approaches showcasing different algorithms and JavaScript patterns:

• Iterative solutions
• Recursive solutions
• Stack-based approaches
• Functional programming approaches
• Two-pointer techniques
• Generator functions for step-by-step visualization
• Performance comparison utilities

Testing

Each solution includes comprehensive test cases and performance comparisons. Run any solution file directly with Node.js to see test results:

# Basic level
node basic/answer1.js
node basic/answer2.js
node basic/answer3.js

# Moderate level
node moderate/answer1.js
node moderate/answer2.js
node moderate/answer3.js

# Advanced level
node advanced/answer1.js
node advanced/answer2.js
node advanced/answer3.js

Completed Implementation

✅ All 9 linked list problems (3 basic, 3 moderate, 3 advanced) have been implemented with multiple ES6+ approaches ✅ Each problem includes comprehensive documentation and test cases ✅ Performance testing utilities are included for comparing approaches ✅ Generator functions provide step-by-step visualization of algorithms ✅ All implementations follow modern JavaScript best practices and idioms