If JavaScript runs on one thread… why doesn’t your app freeze during API calls?
Most people think:
“JavaScript is single-threaded… but somehow works like multithreading.”
That’s not entirely true.
JavaScript doesn’t do multithreading — it handles concurrency.
Here’s the difference:
Multithreading (Java):
• Multiple threads run at the same time
• Tasks execute in parallel
• Output is unpredictable and interleaved
JavaScript (Event Loop):
• One thread only
• Long tasks are delegated to the runtime
• Results are processed later via the event loop
So what’s really happening?
JavaScript avoids waiting.
Instead of doing everything itself, it:
• Delegates slow work (timers, APIs, I/O)
• Keeps executing other code
• Handles results when they’re ready
That’s why it feels like multiple things are happening at once.
But in reality:
→ No parallel execution
→ No thread switching
→ Just smart scheduling
Understanding this changes how you write async code.
Read full blog:
https://lnkd.in/gTmPSJqx
#javascript #webdevelopment #programming #eventloop #concurrency
You can read the blog with this link here: https://medium.com/@Dynasty241/javascript-filter-method-the-complete-guide-with-examples-5fe5278aede2