JavaScript & TypeScript DSA Patterns

A pattern-based collection of JavaScript/TypeScript solutions for LeetCode problems and frontend interview utility implementations.

This repository is organized for fast review, recruiter scanning, and steady interview prep. It highlights practical TypeScript fluency, strong problem-solving fundamentals, and frontend-adjacent JavaScript utility work in one clean codebase.

Why This Repo

• Shows problem solving across core interview patterns
• Shows TypeScript fluency with readable, interview-explainable code
• Shows frontend interview preparation beyond framework APIs
• Covers both DSA and JavaScript utility coding

Tech Stack

• TypeScript
• Node.js
• JavaScript
• Data Structures & Algorithms

Progress

• Total target: 210
• Total problems implemented: 210
• Pending: 0

Category Count

Order	Category	Count
01	Arrays & Hash Map	27
02	Two Pointers	18
03	Sliding Window	13
04	Stack & Queue	17
05	Binary Search	15
06	Linked List	15
07	Trees	21
08	Heap / Priority Queue	15
09	Backtracking	6
10	Graphs	18
11	Intervals	5
12	Dynamic Programming	15
13	JavaScript / Frontend Utilities	21
Total	All Categories	210

Featured Frontend Utility Problems

• Debounce
• Throttle
• Memoize
• Promise Time Limit
• Cache With Time Limit
• Flatten Deeply Nested Array
• Group By
• Chunk Array
• Function Composition
• LRU Cache

How To Run

npm install
npm run typecheck
npm run problem src/01-arrays-hashmap/001-two-sum.ts

You can run any individual solution file the same way:

npm run problem src/05-binary-search/163-median-of-two-sorted-arrays.ts

Repo Structure

javascript-dsa-patterns/
├── docs/
│   ├── patterns.md
│   ├── progress-tracker.md
│   └── study-plan.md
├── src/
│   ├── 01-arrays-hashmap/
│   ├── 02-two-pointers/
│   ├── 03-sliding-window/
│   ├── 04-stack-queue/
│   ├── 05-binary-search/
│   ├── 06-linked-list/
│   ├── 07-trees/
│   ├── 08-heap-priority-queue/
│   ├── 09-backtracking/
│   ├── 10-graphs/
│   ├── 11-intervals/
│   ├── 12-dynamic-programming/
│   ├── 13-javascript-frontend-utilities/
│   └── utils/
├── package.json
├── tsconfig.json
└── README.md

Notes

• Every problem file includes the title, link, difficulty, pattern, approach, time complexity, space complexity, and a small runTests() example.
• Premium-style questions such as Meeting Rooms, Meeting Rooms II, Walls and Gates, and Number of Connected Components in an Undirected Graph are implemented with standard interview-friendly TypeScript signatures.
• Shared helpers live in src/utils/ for linked lists, trees, and priority queues.

Resume Line

Solved 200+ JavaScript/TypeScript DSA problems across arrays, strings, hash maps, sliding window, stacks, trees, graphs, dynamic programming, and frontend utility implementations.