Welcome to the JavaScript & TypeScript Interview Guide! This repository is curated to assist developers in preparing for interviews by covering core concepts, coding challenges, design patterns, and system design principles.

1. JavaScript & TypeScript Core Concepts
2. Beginner Pattern Problems
3. Machine Round & Polyfills
4. Data Structures
5. Low-Level Design (LLD)
6. High-Level Design (HLD)

Folder: 01 - JavaScript & TypeScript Core Concepts

This section delves into fundamental concepts essential for mastering JavaScript and TypeScript.

JavaScript Core Concepts	TypeScript Core Concepts
Arrow Functions	TypeScript Types
Closures
Currying
Generators
Hoisting
Iterators & Iterables
NaN
Rest vs Spread Operator
Scope of Variables
Scope of this
Undefined vs Null
Automatic Semicolon Insertion

Folder: 02 - Beginner Pattern Problems

Enhance your problem-solving skills with these pattern-based challenges.

Star Patterns	Number Patterns	Alphabet Patterns	Miscellaneous Patterns
Rectangle Star Pattern	Binary Number Triangle Pattern	Increasing Letter Triangle Pattern	Symmetric Void Pattern
Half Diamond Star Pattern	Number Crown Pattern	Reverse Letter Triangle Pattern	Symmetric Butterfly Pattern
Diamond Star Pattern	Increasing Number Triangle Pattern	Alpha Ramp Pattern	Hollow Rectangle Pattern
Star Pyramid	Right-Angled Number Pyramid 01	Alpha Hill Pattern	Right-Angled Triangle Pattern
Inverted Star Pyramid	Right-Angled Number Pyramid 02	Alpha Triangle Pattern	Inverted Right Pyramid
	Inverted Numbered Right Pyramid
	The Number Pattern

Folder: 03 - Machine Round & Polyfills

Prepare for machine coding rounds with these practical problems and polyfill implementations.

Function Binding and Invocation

• apply.js
• bind.js
• call.js
• callApplyBindTogether.js

Function Utilities

• InfiniteCurry.js
• MemorizeFunction.js
• curryPlaceholder.js
• currying.js
• oncePolyfiles.js

Functional Programming

• debounce.js
• throttle.js

Polyfills

• PromisePolyfill.js
• filterPolyfils.js
• mapPolyfils.js
• reducePolyfils.js
• setIntervalPolyfill.js

Object and Prototype Manipulation

• Mixin.js
• deepFreeze.js
• deepSeal.js
• proxy.js

Data Conversion and Manipulation

• CSVToJSON.js
• Number To Binary.js
• flattenAnArray.js
• reverseNumber.js
• reverseStr.js

Asynchronous Control

• circuitBreaker.js
• fetchWithTimeout.js
• limitConcurrency.js
• rateLimiter.js

Utility Functions

• cacheApiCall.js
• customCookie.js
• deepFilter.js
• groubBy.js
• removeCircularDependancy.js

Folder: 04 - Data Structures (Not Started Yet)

Folder: 05 - Low-Level Design

Understand system design principles and implement design patterns.

Creational Patterns	Structural Patterns	Behavioral Patterns
Factory Method (Vehicle System)	Proxy Pattern (Secure Bank Account)	Null Object Pattern (Vehicle System)
Abstract Factory (Vehicle System)	Decorator Pattern (Vehicle System)	Chain of Responsibility (Logging System)
Builder Pattern (Vehicle System)	Adapter Pattern (Vehicle Charging System)	Strategy Pattern (Vehicle System)
Facade Pattern (Vehicle System)	Composite Pattern (File System)	Observer Pattern (Traffic Signal)
		State Pattern (Traffic Light System)