72-Returning-values-from-Async.md

Returning values from Async functions in javascript

Async functions in JavaScript use the async/await syntax to allow for asynchronous behavior. When an async function is called and awaited, it returns a promise that will eventually resolve with a value. The value can be returned using the return keyword inside the async function, and it will be wrapped in a resolved promise when the function is completed.

If an error is thrown inside the async function, the promise returned by the function will be rejected with the thrown error as the reason.

Async functions in JavaScript use the async and await keywords to handle asynchronous operations. They always return a Promise, which can be resolved with any value.

Here is an example of an Async function that returns a Promise with a string value:

async function greet(name) {
  return "Hello, " + name + "!";
}

// calling the async function
greet("John").then(result => console.log(result));
// Output: "Hello, John!"

In the example above, the greet function takes a name parameter and returns a Promise that resolves to a string value. We call this function and use the then method to log the result to the console.

We can also use the await keyword to get the resolved value directly from an async function:

async function getName() {
  return "John";
}

async function greet() {
  const name = await getName();
  return "Hello, " + name + "!";
}

// calling the async function
greet().then(result => console.log(result));
// Output: "Hello, John!"

In this example, the getName function returns a Promise that resolves to the string "John". We then call the greet function, which uses the await keyword to wait for the resolved value of getName() before concatenating it with the greeting string.