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Async Patterns in JavaScript

Async Patterns in JavaScript

Learn JavaScript asynchronous patterns to manage code efficiently and enhance user experience.

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Asynchronous programming allows JavaScript to execute non-blocking operations, enabling tasks like fetching data, file reading, or timers to run in the background without halting the execution of other code. This approach is essential in ensuring smooth and responsive applications.

Key asynchronous patterns

We have three primary asynchronous patterns in JavaScript.

Callback functions

Callbacks are functions passed as arguments to other functions. They execute after the completion of an asynchronous operation.

function fetchData(callback) {
    setTimeout(() => {
        callback("Data retrieved!");
    }, 1000);
}
fetchData((message) => {
    console.log(message); // Output: Data retrieved!
});
Fetching data using a callback

In the above code:

  • Line 1: We define a function fetchData that takes a callback parameter. ...

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