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This article will explain in detail how to use promisify in JavaScript. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

Promisify

How to use it:

The promisify function is an auxiliary function that changes the callback function into promise, which is suitable for the callback function of error-first style (nodejs). The principle is that the callback function of error-first style will execute the last callback function no matter whether it succeeds or fails. What we need to do is to let this callback function control the state of promise.

Here, Proxy is also used to proxy the entire fs module and intercept the get method, so that there is no need to manually wrap all the methods of the fs module with a layer of promisify functions, which is more flexible

This is the end of the article on "how to use promisify in JavaScript". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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