what is the role of async and await

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certainly! the `async` and `await` keywords are part of the asynchronous programming model in javascript (and also in other programming languages) that make it easier to work with promises, allowing developers to write cleaner and more readable asynchronous code.

understanding asynchronous programming

in javascript, asynchronous programming allows you to perform tasks without blocking the execution of the code. for example, while waiting for a network request to complete, your application can continue executing other code. this is particularly important in web development, where you want to maintain a responsive ui.

promises

before diving into `async` and `await`, it's essential to understand promises. a promise is an object that represents the eventual completion or failure of an asynchronous operation and its resulting value.

here's a simple example of a promise:



the `async` keyword

the `async` keyword is used to define an asynchronous function. when a function is declared with `async`, it automatically returns a promise. if the function returns a value, that value is wrapped in a promise. if an error is thrown, the returned promise is rejected.

the `await` keyword

the `await` keyword can only be used inside an `async` function. it pauses the execution of the function until the promise is resolved or rejected. this allows you to write code that looks synchronous while still being asynchronous.

example of `async` and `await`

here’s an example that demonstrates how to use `async` and `await` in a practical scenario:



explanation of the code

1. **fetchdata function**: this function simulates a network request that resolves a promise after 2 seconds with some data.
2. **getdata function**: this function is marked as `async`, allowing it to use the `await` keyword.
it first logs a message indicating that data fetching is starting.
the `await fetchdata()` line pauses the execution of `getdata` until the promise returned by `fetchdata` is ...

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