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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