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# 📚 DSA with JavaScript
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# 🧠 JS Data Structures & Algorithms
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Welcome to **DSA with JavaScript**, a comprehensive collection of Data Structures and Algorithms concepts, patterns, and problems – all solved in JavaScript.
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Welcome to the **JS Data Structures & Algorithms** repository!
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This project takes you from **JavaScript basics** all the way to **advanced DSA problems**, making it a perfect companion for interviews, competitive programming, and system design preparation.
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This repository is maintained by [ExploitEngineer](https://github.com/ExploitEngineer) and is built for **beginners and intermediate learners** looking to master DSA for technical interviews, coding contests, and real-world problem solving.
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> 📌 Repository: `js-data-structures-algorithms`
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> 👨‍💻 Author: [ExploitEngineer](https://github.com/ExploitEngineer)
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## 📁 Topics Covered
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### ✅ Topic 1: Basic JavaScript Logic: Variables, Operators, and Operations
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- Sum of integers, type coercion, swap variables
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### 1️⃣ Basic JavaScript Logic
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- Sum of two numbers
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- Type coercion & string concatenation
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- Swap variables (3 methods)
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- Operators: Arithmetic, Relational, Logical, Unary
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- Math functions: `Math.round()`, `Math.sqrt()`, `Math.random()`, etc.
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- Practical problems: Area, Perimeter, OTP generator
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- Math Functions: `round()`, `ceil()`, `floor()`, `trunc()`, `pow()`, `sqrt()`, `abs()`, `random()`, `toFixed()`
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- Problems:
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- Rectangle area & perimeter
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- OTP generator
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- Triangle area (Heron’s formula)
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- Circle circumference
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### ✅ Topic 2: Conditional Statements and Control Flow
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- `if`, `else`, `switch`, ternary operator
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- Problems: Valid user, shop discount, INR denomination, etc.
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### 2️⃣ Conditional Statements & Control Flow
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- If-Else, Ternary, Switch
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- Problems:
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- Valid user checker
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- Shop discount logic
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- Utility bill (Biji bill)
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- INR denomination
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### ✅ Topic 3: Loops
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- `for`, `while`, `do-while` loops
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- Print patterns, factorial, reverse digits, strong number, guess the number
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### 3️⃣ Loops
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- For, While, Do-While
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- Problems:
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- Print "Hello" N times
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- 1 to N and N to 1
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- Sum & factorial
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- Prime number
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- Sum of digits
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- Strong number
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- Reverse number
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- Guess the number
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- Calculator app
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### ✅ Topic 4: Pattern Programming
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- Nested loops & star-pattern problems
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### 4️⃣ Pattern Programming
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- Nested loops
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- Classic pattern problems
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### ✅ Topic 5: Arrays
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- Static & dynamic arrays
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- Max, second max, reverse, zero/one segregation
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### 5️⃣ Arrays
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- Fixed vs Dynamic arrays
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- Accept user input
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- Problems:
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- Sum of elements
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- Max & second max
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- Reverse array
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- Shift zeros left, ones right
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### ✅ Topic 6: Strings
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- Reverse string, palindrome check, toggle case, frequency counter
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### 6️⃣ Strings
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- String methods
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- Problems:
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- Character-by-character printing
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- Reverse string
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- Palindrome checker
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- Toggle case
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- Character frequency
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### ✅ Topic 7: Object-Oriented Programming (OOP)
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- Class, object, `this`, constructor, prototype, design problems
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### 7️⃣ Object-Oriented Programming
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- Class & Object
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- Constructor, `this`, Prototype
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- Design-based problems
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## 🚀 Real Game Starts Here
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## 🔥 The Real DSA Journey Begins Here
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### ✅ Topic 8: Advanced Array Problems
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- Rotation, duplicate removal, merge sorted arrays
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- Kadane’s Algo, stock buy/sell, rainwater trapping, majority element
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### 8️⃣ Advanced Array Questions
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- Left/Right rotation by K
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- Remove duplicates (sorted array)
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- Merge sorted arrays
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- Best time to buy & sell stock
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- Sort colors
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- Kadane’s Algorithm
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- Moore’s Voting
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- Trapping Rain Water
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### ✅ Topic 9: Sorting Algorithms - Part 1
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- Bubble Sort, Selection Sort, Insertion Sort
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### 9️⃣ Sorting Algorithms (Part 1)
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- Bubble Sort
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- Selection Sort
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- Insertion Sort
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### 🔟 Sorting Algorithms (Part 2)
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- Merge Sort
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- Quick Sort
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### ✅ Topic 10: Sorting Algorithms - Part 2
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- Quick Sort, Merge Sort
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### 1️⃣1️⃣ Cyclic Sort
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- Missing number
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- Disappeared numbers
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- First missing positive
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### ✅ Topic 11: Cyclic Sort
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- Missing number, first positive, disappeared numbers
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## 📌 Binary Search
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- Classic Binary Search
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- Search Insert Position
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- Rotated Sorted Array
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- Book Allocation
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- Koko Eating Bananas
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- Threshold limit problems
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### ✅ Binary Search Problems
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- Classic binary search, rotated array, Koko eating bananas, book allocation
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## 🧠 Hashing
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- Frequency map
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- Unique elements
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- Pangram checker
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- Sort by people
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- Two Sum
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- Subarray sum equals K
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- Longest subarray with sum K
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- Longest consecutive sequence
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### ✅ Hashing
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- Frequency count, two sum, pangram check, subarray with sum K
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## 🔗 Linked List
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- Implementation
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- Design LL
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- Find middle
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- Detect cycle
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- Reverse list
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- Delete node
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- Reverse in K groups
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### ✅ Linked List
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- Basic operations, reverse, middle, cycle, k-group reverse
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## 📚 Stack & Queue
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- Stack & Queue implementation
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- Valid parentheses
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- Stack using queue
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- Queue using stack
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- Next greater element
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- Largest rectangle in histogram
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### ✅ Stack and Queue
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- Implementations, valid parentheses, NGE, histograms
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## 🔁 Recursion & Backtracking
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- Print Hello N times
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- N to 1, 1 to N
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- Sum & factorial
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- Digit sum
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- Fibonacci (2 ways)
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- Tower of Hanoi
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- Josephus problem
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- Subsets & permutations
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- Combination sum
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- Sudoku solver
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### ✅ Recursion & Backtracking
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- Fibonacci, Tower of Hanoi, subsets, permutations, Sudoku solver
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## 🌳 Binary Tree
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- Implementation
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- DFS (Pre, In, Post)
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- Max depth
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- Symmetric tree
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- BFS
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- Left & Top view
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- Lowest Common Ancestor
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- Build tree (Preorder + Inorder)
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### ✅ Binary Tree
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- Traversals (DFS/BFS), max depth, symmetry, top/left view, LCA, tree construction
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## 🌲 Binary Search Tree
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- Validate BST
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- Kth smallest in BST
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- Delete node from BST
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### ✅ Binary Search Tree (BST)
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- Validate BST, kth smallest, BST node deletion
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## 🌐 Graph
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- Graph implementation
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- BFS & DFS
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- Cycle detection
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- Topological sort
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- Shortest Path Algorithms
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### ✅ Graphs
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- BFS, DFS, cycle detection, topological sort, shortest path algorithms
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## ⚙️ Tech Stack
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- Language: JavaScript (ES6+)
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- Tools: Git, GitHub, Notion (for notes)
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- Practice Style: Problem-first, then explanation
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## 🧠 Goal
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Build a **solid understanding** of all DSA concepts in JavaScript and create an easy-to-reference solution base for future interviews and projects.
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## 🛠️ Setup
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```bash
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# Clone this repo
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git clone git@github.com:ExploitEngineer/js-data-structures-algorithms.git
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## 📌 Contribution
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This is a personal learning repository. However, feel free to fork it and use the structure for your own learning journey.
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# Move into project folder
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cd js-data-structures-algorithms
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🙌 Contribute
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If you find bugs or want to improve the code/docs:
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## 📬 Stay Connected
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Follow my journey on [GitHub](https://github.com/ExploitEngineer) and feel free to connect if you’re learning along too!
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Star ⭐ this repo
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Fork 🍴 the project
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Open a PR or Issue
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📄 License
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MIT License — feel free to use, modify, or share!
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**Let's crack DSA together – one problem at a time. 💻✨**
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Happy coding, keep learning, and never stop solving! 🚀✨
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