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Rename articles prefixed with javascript-

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Angelos Chalaris
2023-05-18 23:24:53 +03:00
parent db4fc1d50b
commit f1931acb2c
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---
title: What is the difference between synchronous and asynchronous code in JavaScript?
shortTitle: Synchronous vs asynchronous code
type: question
language: javascript
tags: [function,promise]
author: chalarangelo
cover: pineapple-on-green
excerpt: Understanding the differences between synchronous and asynchronous code is a crucial piece of knowledge for every web developer.
dateModified: 2021-11-14T05:00:00-04:00
---
Synchronous code runs in sequence. This means that each operation must wait for the previous one to complete before executing.
```js
console.log('One');
console.log('Two');
console.log('Three');
// LOGS: 'One', 'Two', 'Three'
```
Asynchronous code runs in parallel. This means that an operation can occur while another one is still being processed.
```js
console.log('One');
setTimeout(() => console.log('Two'), 100);
console.log('Three');
// LOGS: 'One', 'Three', 'Two'
```
Asynchronous code execution is often preferable in situations where execution can be blocked indefinitely. Some examples of this are network requests, long-running calculations, file system operations etc. Using asynchronous code in the browser ensures the page remains responsive and the user experience is mostly unaffected.