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But setTimeout(.) also sets up an event (a timeout) to happen later, so the contents of the later() function will be executed at a later time (1,000 milliseconds from now).Īny time you wrap a portion of code into a function and specify that it should be executed in response to some event (timer, mouse click, Ajax response, etc.), you are creating a later chunk of your code, and thus introducing asynchrony to your program. The now chunk runs right away, as soon as you execute your program. In other words, tasks that cannot complete now are, by definition, going to complete asynchronously, and thus we will not have blocking behavior as you might intuitively expect or want.Īnswer = answer * 2 console. The problem most developers new to JS seem to have is that later doesn't happen strictly and immediately after now. The most common unit of chunk is the function. js file, but your program is almost certainly comprised of several chunks, only one of which is going to execute now, and the rest of which will execute later.
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We'll explore a variety of emerging techniques for async JavaScript programming over the next several chapters.īut before we can get there, we're going to have to understand much more deeply what asynchrony is and how it operates in JS. While this all may seem rather abstract right now, I assure you we'll tackle it more completely and concretely as we go on through this book. Many to this day will insist that callbacks are more than sufficient.īut as JS continues to grow in both scope and complexity, to meet the ever-widening demands of a first-class programming language that runs in browsers and servers and every conceivable device in between, the pains by which we manage asynchrony are becoming increasingly crippling, and they cry out for approaches that are both more capable and more reason-able. The good enough approach has always been the humble callback function. But most JS developers have never really carefully considered exactly how and why it crops up in their programs, or explored various other ways to handle it. In fact, the relationship between the now and later parts of your program is at the heart of asynchronous programming.Īsynchronous programming has been around since the beginning of JS, for sure. As they famously say in London (of the chasm between the subway door and the platform): "mind the gap." In all these various ways, your program has to manage state across the gap in time. Practically all nontrivial programs ever written (especially in JS) have in some way or another had to manage this gap, whether that be in waiting for user input, requesting data from a database or file system, sending data across the network and waiting for a response, or performing a repeated task at a fixed interval of time (like animation). It's about what happens when part of your program runs now, and another part of your program runs later - there's a gap between now and later where your program isn't actively executing. This is not just about what happens from the beginning of a for loop to the end of a for loop, which of course takes some time (microseconds to milliseconds) to complete.
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One of the most important and yet often misunderstood parts of programming in a language like JavaScript is how to express and manipulate program behavior spread out over a period of time. ولكن علىabiaquraishi.xyz نقدم .You Don't Know JS: Async & Performance Chapter 1: Asynchrony: Now & Later
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