Async JavaScript Explained: How setTimeout Really Works

📰 Dev.to · Satish

Learn how setTimeout works in JavaScript and understand the concept of asynchronous programming

intermediate Published 28 Feb 2026
Action Steps
  1. Run the code snippet provided to see the output
  2. Use the console.log statements to understand the order of execution
  3. Configure a setTimeout function with a delay of 0 to see how it affects the output
  4. Test the code with different delay values to understand how setTimeout works
  5. Apply the concept of asynchronous programming to real-world scenarios
  6. Compare the output of the code snippet with and without the setTimeout function
Who Needs to Know This

Developers who work with JavaScript and asynchronous programming will benefit from this explanation, as it will help them understand how to use setTimeout effectively in their code

Key Insight

💡 setTimeout is an asynchronous function that executes a callback function after a specified delay, but it does not block the execution of the code

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🚀 Understand how setTimeout works in JavaScript and take your async programming skills to the next level!

Key Takeaways

Learn how setTimeout works in JavaScript and understand the concept of asynchronous programming

Full Article

console.log(1); setTimeout(() => { console.log(2); }, 0); console.log(3); Enter...
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