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What Undercode Say
JavaScript Promises and Async/Await are fundamental concepts in modern JavaScript development. Promises allow you to handle asynchronous operations more cleanly compared to traditional callback functions. Async/Await, built on top of Promises, provides a more readable and concise way to handle asynchronous code. Here are some practical commands and code snippets to help you master these concepts:
JavaScript Promises Example:
[javascript]
let promise = new Promise((resolve, reject) => {
let condition = true; // Simulate a condition
if (condition) {
resolve(“Promise resolved!”);
} else {
reject(“Promise rejected!”);
}
});
promise.then((message) => {
console.log(message); // Output: Promise resolved!
}).catch((error) => {
console.log(error); // Output: Promise rejected!
});
[/javascript]
Async/Await Example:
[javascript]
async function fetchData() {
try {
let response = await fetch(‘https://api.example.com/data’);
let data = await response.json();
console.log(data);
} catch (error) {
console.error(“Error fetching data:”, error);
}
}
fetchData();
[/javascript]
Linux Commands for Developers:
1. Check Node.js Version
node -v
2. Install Node.js
sudo apt-get install nodejs
3. Run a JavaScript File
node filename.js
4. List Running Processes
ps aux | grep node
5. Kill a Process
kill -9 <process_id>
Windows Commands for Developers:
1. Check Node.js Version
[cmd]
node -v
[/cmd]
2. Run a JavaScript File
[cmd]
node filename.js
[/cmd]
3. List Running Processes
[cmd]
tasklist | findstr node
[/cmd]
4. Kill a Process
[cmd]
taskkill /PID
[/cmd]
Additional Resources:
- JavaScript Promises Documentation: MDN Web Docs
- Async/Await Documentation: MDN Web Docs
By mastering these concepts and commands, you can significantly improve your efficiency in handling asynchronous operations in JavaScript. Whether you’re working on the front-end or back-end, these skills are essential for modern web development. Keep practicing and exploring more advanced topics to stay ahead in the ever-evolving tech landscape.
References:
Hackers Feeds, Undercode AI
