async await javascript

Author: mzb2599

Javascript_Study_Month/week4/asyncAwait.js

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+//Async await
+//Async await is a syntactic sugar over promises, making asynchronous code look 
+// and behave more like synchronous code. It is built on top of promises 
+// and allows you to write cleaner and more readable code when dealing with asynchronous operations.
+
+// An async function is a function that is declared with the async keyword,
+// and it always returns a Promise. The await keyword can only be used inside async functions.
+// When you use await, it pauses the execution of the async function until the Promise is resolved or rejected.
+// Creating an async function
+async function fetchData() {
+ try {
+ // Simulating an asynchronous operation using a Promise
+ const data = await new Promise((resolve, reject) => {
+ setTimeout(() => {
+ const success = true; // Change this to false to simulate a failure
+ if (success) {
+ resolve("Data fetched successfully!");
+ } else {
+ reject("Failed to fetch data.");
+ }
+ }, 2000); // 2 seconds delay
+ });
+ console.log("Success:", data); // This will run if the promise is fulfilled
+ } catch (error) {
+ console.error("Error:", error); // This will run if the promise is rejected
+ } finally {
+ console.log("Fetch operation has been settled (either fulfilled or rejected).");
+ }
+}
+// Calling the async function
+fetchData();
+// Output after 2 seconds:
+// Success: Data fetched successfully!