Lakhveer Singh Rajput Blog's: 🌟 Insights on Tech, Coding, and Personal Growth 🚀💡

🚀 Crack the Code: Advanced Python Interview Questions (With Deep Explanations & Examples) 🐍🔥 Python interviews at a senior / advanced level don’t test syntax — they test how you think . This guide will help you stand out by mastering advanced concepts , real-world examples , and interview-winning tricks 💡 🧠 1. What is the difference between __new__() and __init__() ? 🔍 Explanation __new__() creates the object __init__() initializes the object __new__() is called before __init__() . 🧪 Example class Demo : def __new__ ( cls ): print ( "Creating instance" ) return super ().__new__(cls) def __init__ ( self ): print ( "Initializing instance" ) obj = Demo() ✅ Output Creating instance Initializing instance 📌 Used in: Singletons, immutable objects 🧠 2. Explain Python’s Global Interpreter Lock (GIL) 🔍 Explanation The GIL allows only one thread to execute Python bytecode at a time. ❌ Problem CPU-bound multithreadi...

🚀 JavaScript Top Tricks for Advanced Interviews: Crack Any Coding Round Like a Pro 💡 JavaScript is one of the most popular programming languages, and with its dynamic nature, it offers plenty of hidden tricks that can impress interviewers. Whether you’re preparing for FAANG interviews or top product-based companies, knowing these advanced tricks can set you apart. Let’s dive into the top JavaScript tricks that often appear in advanced interviews, with examples explained in depth . 🧑‍💻🔥 1️⃣ Trick: == vs ===  — The Type Coercion Magic Many developers know the difference, but interviews often go deeper. console . log ( 0 == false ); // true console . log ( 0 === false ); // false console . log ( null == undefined ); // true console . log ( null === undefined ); // false Why? == performs type coercion → converts values to the same type before comparing. === checks for strict equality without type conversion. 👉 Interview Insight: Interviewers often test your knowled...

🏗️ Mastering System Design for Senior-Level Interviews: Crack It with Structure & Smarts! 🎯 System Design is the litmus test for senior developers and architects. It’s not just about writing code — it’s about solving real-world problems at scale . From building a Twitter clone to designing an e-commerce backend, you’re judged on how you think, scale, and solve . 💡 🎓 What Is System Design? System Design involves designing the architecture of complex systems. It tests: 🔍 Requirements analysis 🗃️ Database design 🏗️ Architecture decisions (monolith, microservices) 🔄 APIs and communication ⚖️ Load balancing, caching, scaling 🔐 Security and rate limiting 📈 Monitoring and logging 💥 Interview Format A typical System Design interview lasts 45–60 mins and is structured as: 🧪 Example Problem: Design a URL Shortener (like Bit.ly) 🔗 🔍 Step 1: Clarify the Requirements Ask: Should the URLs be customizable? Expiry time? Analytics needed? Scale: Read-heavy or Write-heavy? Assume...

  🧠 JavaScript Tricky Questions You Must Master for Your Next Interview! 🚀 JavaScript may look friendly, but under the hood, it’s full of quirks that even experienced developers get stumped by! 😅 Whether you’re prepping for your next big tech interview or want to level up your JS brain, here are some tricky and mind-bending questions with real-world examples. 💡 Let’s dive deep! 🏊‍♂️ 🔥 1. What is the result of [] + [] and why? Answer: "" (an empty string) console . log ([] + []); // "" Why? When using + with arrays, JavaScript tries to convert both operands to strings and then concatenate them. []. toString (); // "" So essentially it becomes: "" + "" => "" 🤯 Mind blown? It gets crazier! 🌀 2. What is the output of [1,2,3] + [4,5,6] ? Answer: "1,2,34,5,6" console . log ([ 1 , 2 , 3 ] + [ 4 , 5 , 6 ]); // "1,2,34,5,6" JavaScript converts both arrays to strings: [ 1 , 2 , 3 ]. toString (); // ...

  🔥 Top 10 ReactJS Interview Questions You Can’t Afford to Miss! 🚀 Are you preparing for a ReactJS interview? With React’s dominance in front-end development, acing your interview requires more than just basic knowledge. Let’s dive into the top 10 ReactJS interview questions , detailed answers, and examples to help you shine! 💡 1. What is React, and what are its key features? Answer : React is a JavaScript library (not a framework!) for building dynamic, component-based UIs. Key features: Virtual DOM : Efficiently updates the real DOM by comparing virtual snapshots. Components : Reusable, self-contained UI elements (class or functional). JSX : HTML-like syntax for writing UI logic. Unidirectional Data Flow : Props pass data from parent to child. Example : // Functional Component with JSX const Greeting = ( ) => < h1 > Hello, React! 👋 </ h1 > ; 2. Explain the difference between State and Props. Answer : Props : Immutable data passed from parent to child . ...

  � JavaScript’s Trickiest Questions for Advanced Developers 🧩: Crack the Code Like a Pro! 🚀 JavaScript is a powerful and versatile language, but it can also be tricky, especially for advanced developers who dive deep into its nuances. Whether you’re preparing for a technical interview or just want to level up your skills, understanding these tricky questions will help you write cleaner, more efficient code. Let’s explore some of the trickiest JavaScript questions, break them down with examples, and share tips to write pro-level code! 💡 1. What’s the Output of typeof null ? 🤔 Question: console . log ( typeof null ); Answer: The output is "object" . 😮 Explanation: This is a long-standing bug in JavaScript that dates back to its early days. The typeof operator incorrectly identifies null as an object. To check for null , use: console. log (myVar = = = null ); / / true if myVar is null 2. Why Does 0.1 + 0.2 !== 0.3 ? 🧮 Question: console. log ( 0.1 + 0.2 === 0....