Node.js: How Threads and Event Loop Enable Scalability

Spring Webflux vs Vert.x for building reactive, event-driven applications? I hardly come across people building with Vert.x and sometimes it shocks me that a toolkit this powerful gets looked over by a lot of people. Vert.x vs Spring Webflux for building state-of-the-art microservices is a hot discussion that could easily spark a war but does it really matter? Like I shared before, customers don't care which you end up using. If we shipped a product, end users never asked us what underlying technology we used. Years ago I would've spent time advocating why Vert.x was the sure way to go, emphasizing how it is un-opinionated, lightweight and a complete toolkit that gives you more flexibility, modularity etc. But now I've been forced by market demand to build so much with Spring that it no longer really matters much. #SoftwareDevelopnent #SoftwareEngineering #Java #Springboot #SpringWebFlux #Vertx #Golang #Kotlin #JavaScript #Rust #TypeScript #Python #Programming #Web

🔥 Smallest Missing Multiple of K in JavaScript - 👉 Day 15 / Day 93 👈 👉 Given an integer array nums and a number k, return the smallest positive multiple of k that’s missing from nums. 🧠 Key idea: - Store numbers in a Set for constant-time lookup. - Increment through multiples of k until a missing one is found. #JavaScript #LeetCode #CodingChallenge #ProblemSolving #Algorithms #DataStructures #FrontendDeveloper #CodeNewbie #Programming #Tech #frontend #Angular #AngualrDeveloper

Day 10 of making my slef a BRAND 1 : Node js depend on Googles V8 to convert js code into machine code and libuv for file accessing and thread pools etc 2 : As in node environment js runs in a single thread, 1. program is initiallized, 2. top level code is executed, 3.modules are required, 4. callbacks are registered, 5 . event loop starts running. 3 : event loops executes the callbacks and if some code takes longer to run that is pushed to threads in the thread pool 4 : there can be 4 - 128 threads in the thread pool 5 : Node js is based on event driven architeccture, which means that events are thrown on multiple occassion eg. file reading is finished 6 : And callbacks are associated with events, those callbacks are executed in event loop 7 : And callbacks taking more time are provided to one of the thread from thread pool to be executed in background #NodeJS #JavaScript #BackendDevelopment #FullStackDeveloper #WebDevelopment #SoftwareEngineering #Programming #AsyncProgramming #EventLoop #V8Engine #Libuv #ThreadPool #NodeJSEventLoop #JavaScriptDeveloper #MERNStack #TechLearning #CodingJourney #DeveloperCommunity #CodeNewbie #NodeJSTips #JSPerformance #Concurrency #NonBlockingIO #ServerSideJS #WebDevCommunity #BackendEngineer #ScalableApps #TechEducation #LearningInPublic #BuildInPublic #100DaysOfCode #DeveloperLife #WebEngineering #CodingInsights #JSRuntime #NodeInternals #ProgrammingConcepts #AsynchronousCode #CodeWithUzair #TechExplained #JSArchitecture #SoftwareDeveloper #NodeJSLearning #NodeJSEngine #CodingDaily #CodeSharing #NodeMastery #V8AndLibuv #TechContent #DeveloperGrowth

🔥 How Native Code Runs in the Browser: The Magic Behind WebAssembly Most developers still wonder: How do Rust, C/C++, Java, Go, Zig, or even Python run inside a browser — a place with no syscalls, no filesystem, no sockets, no processes, and no kernel? 🤯 Yet today we run: ⚡ Rust in Chrome ⚡ FFmpeg + ImageMagick fully client-side ⚡ Python, Ruby, Lua, Go via WASM ⚡ SQLite in a webpage ⚡ Game engines, physics engines & more So what’s the secret? 👉 WebAssembly isn’t an OS — it’s just a CPU. Browsers don’t give native APIs, so toolchains fake them using virtual syscalls, JS shims, and emulated OS layers. ✔ Virtual filesystems (MEMFS, IDBFS, OPFS) ✔ Threads via Web Workers + SharedArrayBuffer ✔ Networking via WebSockets/WebRTC ✔ Syscall virtualization through Emscripten, WASI & JS glue ✔ Stubbing + Polyfills for unsupported features In short: 💡 JavaScript becomes the kernel. 💡 WebAssembly gets a fake OS. 💡 Native code just runs, blissfully unaware it’s in a sandbox. This is how the modern web can execute “native” workloads—from video processing to ML inference—right in your browser. https://lnkd.in/gBFJnene #WebAssembly #WASM #Emscripten #WASI #RustLang #CProgramming #CPlusPlus #GoLang #Java #GraalVM #ZigLang #DevTools #WebDevelopment #Browsers #FrontendEngineering #SystemsProgramming #DeveloperExperience #PerformanceEngineering 🚀

⚡ 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁 𝗣𝗿𝗼𝗯𝗹𝗲𝗺 #𝟭 — 𝗣𝗿𝗶𝗻𝘁 𝗘𝘃𝗲𝗻 𝗡𝘂𝗺𝗯𝗲𝗿𝘀 𝗕𝗲𝘁𝘄𝗲𝗲𝗻 𝟭 𝗮𝗻𝗱 𝗡 Today’s problem looks simple… but it’s the foundation of loops and logic — the building blocks of programming. 🧠 let N = 20; for (let i = 1; i <= N; i++) { if (i % 2 === 0) { console.log(i); } } ✅ 𝗢𝘂𝘁𝗽𝘂𝘁: 2, 4, 6, 8, ... 🧩 𝗪𝗵𝗮𝘁 𝘁𝗵𝗶𝘀 𝘁𝗲𝗮𝗰𝗵𝗲𝘀 𝘂𝘀: 𝟭.% (𝗺𝗼𝗱𝘂𝗹𝘂𝘀) 𝗵𝗲𝗹𝗽𝘀 𝗰𝗵𝗲𝗰𝗸 𝗱𝗶𝘃𝗶𝘀𝗶𝗯𝗶𝗹𝗶𝘁𝘆 — 𝘂𝘀𝗲𝗱 𝗵𝗲𝗿𝗲 𝘁𝗼 𝗱𝗲𝘁𝗲𝗰𝘁 𝗲𝘃𝗲𝗻 𝗻𝘂𝗺𝗯𝗲𝗿𝘀. 𝟮.=== 𝗶𝘀 𝘀𝘁𝗿𝗶𝗰𝘁 𝗲𝗾𝘂𝗮𝗹𝗶𝘁𝘆 (𝗻𝗼 𝘂𝗻𝗲𝘅𝗽𝗲𝗰𝘁𝗲𝗱 𝘁𝘆𝗽𝗲 𝗰𝗼𝗲𝗿𝗰𝗶𝗼𝗻). 𝟯.𝗟𝗼𝗼𝗽𝘀 + 𝗰𝗼𝗻𝗱𝗶𝘁𝗶𝗼𝗻𝘀 = 𝘁𝗵𝗲 𝗳𝗼𝘂𝗻𝗱𝗮𝘁𝗶𝗼𝗻 𝗼𝗳 𝗮𝗹𝗴𝗼𝗿𝗶𝘁𝗵𝗺𝗶𝗰 𝗹𝗼𝗴𝗶𝗰. 💪 👉 𝗣𝗿𝗼 𝘁𝗶𝗽:If you only need even numbers, you can loop with i += 2 starting at 2 to cut iterations in half. #javascript #learnwithzeba #codingjourney #frontend #webdevelopment #javascriptseries

🔁 JavaScript Loops — They Literally Put Me in a Loop 😅 Started learning loops today, and wow… they’re the real deal when it comes to writing less code that does more! ⚙️ Loops basically say: > “Why write it ten times when I can do it for you?” 😎 Here’s what I explored 👇 🔹 for loop — when you know exactly how many times to run 🔹 while loop — keeps going as long as the condition’s true 😆 🔹 do...while — runs at least once, no matter what 🔹 for...of / for...in — the cleanest way to loop through arrays and objects It’s crazy how something so simple can automate so much logic 🔄 Feeling one step closer to thinking like a developer now 💪 Next stop → Functions, where the real magic begins! ✨ #JavaScript #WebDevelopment #Frontend #CodingJourney #Loops #Programming #LearningInPublic #DeveloperLife #CleanCode #100DaysOfCode

Diving DEEP into the Node.js event loop! ⏱️ Ever wondered how Node.js handles concurrency with a single thread? Understanding the event loop is CRUCIAL for writing efficient and scalable Node.js applications. It's where the MAGIC happens! Here are 3 KEY takeaways: 💡 Understand the difference between blocking and non-blocking I/O. Blocking I/O HALTS the event loop! ⚙️ Use `setImmediate` for callbacks that should execute AFTER each event loop iteration. `setTimeout(0)` can behave differently. 🧵 Tune your `UV_THREADPOOL_SIZE` for CPU-bound tasks. It defaults to 4, but you might need MORE! What's YOUR favorite Node.js optimization trick? Share below! 👇 #Nodejs #Javascript #EventLoop #Backend #Programming #Async #Concurrency

🔍 Does JavaScript Really Have a Compiler? Let’s Clear the Myth! Many believe “Scripting languages don’t have a compiler.” But here’s the twist — JavaScript actually does! 🧠 Let’s decode this clearly 👇 1️⃣ Every JS engine has a compiler — Engines like V8 and SpiderMonkey compile your code behind the scenes. 2️⃣ It uses JIT (Just-In-Time) Compilation — Code is compiled while executing, not as a separate step like Java. 3️⃣ No .class or .exe files — JS compiles in memory and executes instantly. 4️⃣ Creation Phase = Internal Compilation — The engine sets up the execution environment, allocates memory, and imports modules before running the code. 5️⃣ Optimization on the fly — Frequently used (hot) code is recompiled and optimized for performance. So, the JavaScript is compiled, “It is, just not the way traditional languages do it!” ⚡ #JavaScript #WebDevelopment #ProgrammingConcepts #SoftwareEngineering #JSTips #TechCommunity #FrontendDevelopment #CodingInsights

Choosing your backend weapon! This trio dominates the server-side. #Java: The battle-tested titan. Think security, massive scale, and the powerful Spring ecosystem. #JavaScript (Node.js): The speed demon. Built for non-blocking, event-driven architectures perfect for APIs and microservices. #Python: The productivity king. Loved for its clean syntax and incredible strength in data, ML, and web apps with Django/Flask. #Backend #Programming #Developer #Java #JavaScript #Python #Tech

Day 26 – Understanding Scope, Closure & Higher-Order Functions in JavaScript Today I learned about three powerful concepts in JavaScript: Scope, Closure, and Higher-Order Functions. These concepts helped me understand how data access and function behavior actually work behind the scenes. The lecture was deeply insightful and covered ideas that are rarely explained this clearly. Thanks to Rohit Negi for the guidance. #coderArmy #JavaScript #WebDevelopment #Frontend #LearningInPublic #Programming #tech #coding #GrowthJourney