You Don't Know JS: Async & Performance by Kyle Simpson PDF

By Kyle Simpson

ISBN-10: 1491905204

ISBN-13: 9781491905203

Regardless of how a lot event you could have with JavaScript, odds are you don’t totally comprehend the language. As a part of the "You Don’t comprehend JS" sequence, this compact consultant makes a speciality of the hot asynchronous positive aspects in JavaScript, that are frequently complicated to builders. You'll find out about grants, turbines, and coroutines, all of which let you create extra refined single-page internet functions that supply the beneficial properties of a machine program with no tying up the user's browser.

Like different books during this sequence, You Don’t understand JS: Async & Performance dives into trickier components of the language that many JavaScript programmers easily steer clear of. Armed with this data, you could in attaining precise JavaScript mastery.

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Extra resources for You Don't Know JS: Async & Performance

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The issue we want to address first is the inversion of control, the trust that is so fragilely held and so easily lost. Recall that we wrap up the continuation of our program in a call‐ back function, and hand that callback over to another party (poten‐ tially even external code) and just cross our fingers that it will do the right thing with the invocation of the callback. ” But what if we could uninvert that inversion of control? What if, instead of handing the continuation of our program to another party, we could expect it to return us a capability to know when its task finishes, and then our code could decide what to do next?

You probably wouldn’t want to show the DOM element before it had content, so the coor‐ dination must ensure proper ordering interaction. Some concurrency scenarios are always broken (not just sometimes) without coordinated interaction. 2", bar ); In this example, whether foo() or bar() fires first, it will always cause baz() to run too early (either a or b will still be undefined), but the second invocation of baz() will work, as both a and b will be available. There are different ways to address such a condition.

Instead, we plan things out carefully, sequentially (A, then B, then C), and we assume to an extent a sort of temporal blocking that forces B to wait on A, and C to wait on B. When a developer writes code, they are planning out a set of actions to occur. If they’re any good at being a developer, they’re carefully planning it out. “I need to set z to the value of x, and then x to the value of y,” and so forth. When we write out synchronous code, statement by statement, it works a lot like our errands to-do list: // swap `x` and `y` (via temp variable `z`) z = x; x = y; y = z; These three assignment statements are synchronous, so x = y waits for z = x to finish, and y = z in turn waits for x = y to finish.

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You Don't Know JS: Async & Performance by Kyle Simpson


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