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💻 Computer Science — PCS Exam Notes

Target: Lower PCS (Uttar Pradesh) | Subject: Computer Fundamentals & IT

⚡ Topics are ordered by exam frequency — study top sections first!

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📋 Table of Contents

| # | Topic | Pages | Frequency |

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How JavaScript Works — Under the Hood 🧠

Most developers use JavaScript. Few understand what the engine actually does when your code runs. This series covers the internals — what no tutorial teaches but every senior dev is expected to know.

**Who is this for?** - 🔵 **Experienced devs** filling the "I know it works, but not *why*" gap - 🟢 **Ambitious freshers** who want to stand out in interviews - Anyone who has ever been confused by `this`, hoisting, closures, or async timing

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JavaScript Complete Roadmap 🚀

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Table of Contents

1. JavaScript Basics
2. Modern JavaScript — ES6+
3. Important Core Concepts
4. Async JavaScript

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Google Calendar — Frontend System Design

A Complete Guide to Cracking FAANG/MAANG Interviews

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Table of Contents

1. Problem Statement & Scope
2. Functional Requirements
3. Non-Functional Requirements

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JavaScript Type Coercion: From Basic to Advanced

A complete guide to understanding how JavaScript silently converts types — and how to master it.

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Table of Contents

1. What is Type Coercion?
2. JavaScript's Type System

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Frontend System Design Prep Guide

LLD · HLD · Architecture · Interview Patterns

A complete reference for senior frontend engineers preparing for system design interviews at FAANG and product companies. Covers component-level LLD, application-level HLD, scalability, performance, and real-world design walkthroughs.

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📚 Table of Contents

Low-Level Design (LLD)

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🧠 Top 100 Tricky JavaScript Output Problems

Test your JavaScript knowledge with these output-based puzzles, organized by topic.
Each problem shows a code snippet — try to predict the output before revealing the answer!

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📚 Table of Contents

1. Type Coercion & the + Operator — Q1–Q10

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The + Operator in JavaScript

The + operator is one of the most versatile — and most confusing — operators in JavaScript. It does two very different things depending on the types of its operands.

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1. Addition (Numbers)

If both operands are numbers, it behaves like normal math:

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Frontend Interview Guide

Table of Contents

JavaScript Core

• Variables: var, let, const
• Scope: global, function, block
• Hoisting
• Closures
• Execution Context

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Java Collections — Complete Reference for DSA & Daily Use

A categorized guide to Java's Collection Framework covering the most-used methods in competitive programming, DSA problem solving, and everyday development.

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Table of Contents

1. Collection Framework Overview
2. List Interface