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javascriptasynchronous
Jeffrey
Jeffrey

Reputation: 29

Short summary of an Javascript async functions

Im new to programming and am confused about the async function present in the javascript language. Why do you use it, and how?

Short demo:

function resolveAfter2Seconds() {
  return new Promise(resolve => {
    setTimeout(() => {
      resolve('resolved');
    }, 2000);
  });
}

Upvotes: 0

Views: 68

Answers (2)

Maurice Lam
Maurice Lam

Reputation: 1794

If we start from first principles, it will be helpful to understand what "asynchronous" means:

https://developer.mozilla.org/en-US/docs/Glossary/asynchronous

Asynchronous software design expands upon the concept by building code that allows a program to ask that a task be performed alongside the original task (or tasks), without stopping to wait for the task to complete.

And have a good understanding of the different approaches to handle asynchronicity like callbacks functions and promises.

If you have those, @Jeffrey's answer is a solid explanation of what the async-await syntax is – a nicer way to express what promises do. For further reading you can see Making asynchronous programming easier with async and await.

Upvotes: 0

Jeffrey
Jeffrey

Reputation: 29

An async function is a function declared with the async keyword. Async functions are instances of the AsyncFunction constructor, and the await keyword is permitted within them. The async and await keywords enable asynchronous, promise-based behavior to be written in a cleaner style, avoiding the need to explicitly configure promise chains.

Upvotes: 2

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