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

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

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

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.

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!

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

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.

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

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

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

1. Collection Framework Overview
2. List Interface

Current Date: April 2026 Focus Period: 2025-2026 (Last 6-12 months) | Revise Strongly: Jan-Apr 2026 (Last 3 months) Daily Practice: 15-20 mins | Weekly Revision + MCQ Practice

Duration: April 2025 → April 2026 | Study: ~4 hrs/day on office schedule | Target: PCS / SDM / DSP

1. Exam Structure Overview
2. Prelims Syllabus

• GS Paper I Topics

A deep-dive reference for designing a production-grade calendar application — covering data modelling, architecture, event rendering, APIs, and optimization.

1. Overview
2. Functional Requirements