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What are some of the asynchronous patterns in JavaScript?
Over the years, patterns and libraries emerged in the JS ecosystem to handle asynchronous programming, such as callbacks, events, promises, generators, async/await, web workers and packages on NPM registry like async, bluebird, co or RxJS.
How to use async and await in Node.js?
Run index.js file using the following command: 3. Async-await: It is a method in which parent function is declared with the async keyword and inside it await keyword is permitted. The async and await keyword enables asynchronous, promise-based behavior so that code could be written a lot cleaner and avoid promise chains.
How is an asynchronous call handled in JavaScript?
The JavaScript code triggering such an operation registers a callback, which is invoked with the result once the operation is finished. The invocation is handled via the task queue. This style of delivering a result is called asynchronous because the caller doesn’t wait until the results are ready.
How is a result delivered in JavaScript asynchronously?
Then the result should be delivered in a different manner: The caller shouldn’t have to wait (synchronously) until the result is ready; it should be notified (asynchronously) when it is. One way of delivering the result asynchronously is by giving divide () a callback function that it uses to notify the caller.
How are promises chainable in async JavaScript?
Promises are chainable, you can return a Promise from .then, tack another .then and keep it going, no crazy indent stuff. You can define a single error handler using .catch added to the end of your promise chain. One small function per async step (inside .then) makes it easier to break down long asynchronous flows.
How are errors handled in async JavaScript code?
Duplicated error-handling which makes it easy to swallow errors. Promises are chainable, you can return a Promise from .then, tack another .then and keep it going, no crazy indent stuff. You can define a single error handler using .catch added to the end of your promise chain.
Where can I find async JavaScript live coding workshop?
Live-coding/workshop section touching on both Node and client-side JS situations at github.com/HugoDF/async-js-presentation/tree/master/workshop. This given as a talk at Codebar London January Monthly 2019, see the slides: