592.7K
THThe event loop in 60 seconds! Full video on my YouTube channel 🎥
@theavocoder
#Event Loop
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THEver wondered how JavaScript manages to handle multiple tasks at once — without being multithreaded?
That’s the magic of the Event Loop
It decides when your code actually runs, and why some things seem to run instantly while others wait!
Once you understand the Event Loop, async code (setTimeout, promises, async/await) will finally start to make sense
Watch till the end — this concept is asked in almost every frontend interview!
@thescriptstyle
#javascript #eventloop #javascriptinterviewquestions #thescriptstyle #frontenddeveloper #webdevelopmenttips #learnjavascript #codenewbie #jsforbeginners #asyncawait #codingreels #developerreels #webdevcommunity #javascripttips #100daysofcode #techreels #webdevindia #frontendinterviewquestions #codingeducation
@thescriptstyle
5.6K
INmerge conflict 😪😂
📌 Save this if the Event Loop ever confused you again!
More daily dev memes → @instatushq
#frontend #meme #backend #github #codingmemes
@instatushq
25.2K
MOUnderstand the Event Loop = master async JavaScript 💡
Promise always runs before setTimeout — know the “why”, not just the rule.
Follow @mohitdecodes for daily JS interview shorts
#javascript #eventloop #jsinterview #webdevelopment #mohitdecodes
@mohitdecodes
9.6K
MUThink of it like this: more workers doesn’t always mean more work gets done.
Multi-threaded databases introduce overhead through synchronization. When multiple threads access shared data, they rely on locks, which can block execution and create contention. On top of that, the CPU performs frequent context switching between threads, which adds latency and reduces overall efficiency.
Why is Redis so fast?
Redis avoids this entirely by running on a single thread, so there is no locking or contention. It also stores data in memory, eliminating disk I/O, and uses an event loop with I/O multiplexing to handle many connections efficiently. This allows Redis to process a high volume of requests with minimal overhead.
#softwareengineer #tech #cs #backenddeveloper
@muniker.codes
7.1K
REevent loop: the interview question everyone gets wrong.
#javascript #eventloop #asyncjavascript #callstack #microtasks webdevelopment
frontenddeveloper softwareengineering codinginterview jsinterview
developersofinstagram programmingreels techreels learnjavascript
@refactor.dev
4.5K
SUNode.js runs on a single thread… but still handles thousands of requests.
So why doesn’t it freeze?
The answer: the Event Loop.
Think of Node.js like a smart chef.
A normal chef cooks one dish, waits for it to finish, then starts the next — slow and blocking.
Node.js doesn’t wait.
It starts cooking one dish, moves to the next, and keeps checking which one is ready.
That’s exactly how the Event Loop works.
Here’s what’s happening under the hood:
Your code runs on the call stack — one task at a time.
But when Node.js encounters slow operations like:
• database queries
• file reads
• API calls
It offloads them to the background and keeps executing other tasks.
Once those operations finish, their results are queued.
The Event Loop then pushes them back to the call stack when it’s free.
Simple way to think about it:
Node.js doesn’t block.
It keeps moving… and handles tasks when they’re ready.
@sujan.codes
9.5K
EMComment JS below and I’ll DM you some of the most useful resources to get started. 📩
You don’t need to memorize every JavaScript method to get good at it. ❌
JavaScript is about understanding how things work in the browser and how your code actually runs.
It helps you build interactive applications, manage data, and connect everything from the frontend to the backend.
Understanding concepts like closures, async behavior, and the event loop is what makes a real difference in your code.
Focusing on how and why things work, not just syntax, is what takes you from writing code to building real projects.
Comment JS below and I’ll DM you some of the most useful resources to get started. 📩
@emrcodes
142.0K
MIIt sounds impossible… but it’s actually smart engineering.
Comment "blog" for detailed blog.
⸻
➡️ 1️⃣ No Thread Switching Overhead
Redis runs on a single event loop, no context switching between threads.
Example: One cashier serving customers quickly instead of 5 cashiers fighting over the same drawer.
⸻
➡️ 2️⃣ Everything Is In-Memory
Redis stores data in RAM, not disk.
Example: Reading from RAM takes microseconds vs milliseconds from disk.
⸻
➡️ 3️⃣ Non-Blocking I/O (Event Loop Model)
Uses an event-driven model (epoll/kqueue).
Example: While waiting for one client’s network response, it serves others instead of waiting idle.
⸻
➡️ 4️⃣ Simple Data Structures
Optimized internal structures (hash tables, skip lists).
Example: Fetching a user session is just a quick hash lookup - no heavy joins.
⸻
➡️ 5️⃣ Pipelining
Clients can send multiple commands at once without waiting for each response.
Example: Instead of 10 back-and-forth trips, send 10 commands in one go.
⸻
➡️ 6️⃣ Horizontal Scaling
Redis scales using replication and clustering.
Example: 1 instance handles 100K ops → 10 shards handle 1M+ ops.
⸻
➡️ 7️⃣ Multi-Threaded I/O (Modern Redis)
Newer versions use threads for network I/O while keeping command execution single-threaded.
(redis architecture explained, redis single threaded performance, how redis handles high throughput, redis event loop model, in memory database performance, redis pipelining and clustering, backend performance optimization)
#Redis #BackendEngineering #SystemDesign #ScalableSystems #DistributedSystems
@mission_compile
5.2K
SHHow does Node.js handle 10,000+ users without crashing? 🤯
Most people think Node.js is slow because it’s single-threaded…
But the truth is 👇
⚡ Event Loop + Non-Blocking I/O = Massive Scale
This is why Node.js powers apps like Netflix, Uber, and PayPal.
Save this 🔖 if you’re learning backend or preparing for interviews.
#nodejs #javascriptdeveloper #backenddeveloper #webdeveloper #programminglife #codinglife #softwareengineer #techreels #devreels #learnprogramming #systemdesign #eventloop #computerscience
node js explained
node js concurrency
backend development
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system design basics
coding interview prep
web backend
@shubhamkulkarni_insta
22.4K
CONode.js is single-threaded… and still handles millions of users 🤯
Sounds impossible?
Here’s the truth 👇
Node.js doesn’t wait.
It delegates work, keeps the event loop free,
and handles concurrency without blocking.
One thread for JavaScript.
Multiple threads under the hood.
Zero wasted CPU cycles.
That’s why Node powers real-time apps, APIs, and systems at scale.
If you still think
“single-threaded = slow”
you’re thinking in the wrong decade.
🚀 Event Loop
⚙️ Non-blocking I/O
🧠 Concurrency without chaos
#NodeJS #EventLoop #Concurrency #BackendEngineering #SystemDesign
JavaScript WebDevelopment SoftwareEngineering TechExplained
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@codewithupasana
58.6K
TENode.js is single-threaded… but still handles multiple tasks
Day 31: Event Loop explained.✅💻❤️
#techfocusss #coding #webdevelopment #webdeveloper #frontend #backend #javascript #nodejs #expressjs #api #server #restapi #cors #singlethread #eventloop #tech #programming #ai #technology #tools #trending #viral #viralreeĺs #reels #reelitfeelit #reelkarofeelkaro #reelsinstagrm #contentcreator
@techfocusss
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