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Their primary use case is in representing lazy possibly infinite sequences. For example, the following function returns the first n positive integers. The reason this is so exciting, is that we can exploit the ability to pause a function in order to help us write asynchronous code.
What generators do not do is give us a way of representing the result of an asynchronous operation. For that, we need a promise. The goal of this article is to teach you to be able to write code like: The result of calling the login function would be a promise.
How it works - Fulfilling As you saw in the introduction, we can pause to wait for a promise using the yield keyword. What we need now is a way to get fine control over that generator function so as to have it start again once the promise completes.
Fortunately, it's possible to step through a generator function via the. The function can then move on to the return statement to return a final result.
We can use this, by calling. How it works - Rejecting We also need a way to represent a promise that's been yielded being rejected.
We can use the. We can then signal rejection using d. In our example, this will trigger the catch block. How it works - Putting it all together Putting all of this together, we just have to keep manually moving the generator forwards with the results of any promises it has yielded.
We can do that using a simple function like this one: MDN - The mozilla developer network has great documentation on promises.The Young Living Essential Oils Sourcing Standard helps ensure a high level of quality and authenticity of essential oils while encouraging responsible practices of .
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A promise represents the eventual result of an asynchronous operation.
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The primary way of interacting with a promise is through its then method, which registers callbacks to receive either a promise’s eventual value or the reason why the promise cannot be fulfilled.
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