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This article introduces the knowledge of "the use of decorators in Go language". Many people will encounter this dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Go's decorator essentially allows you to wrap existing functionality and add your own custom functionality, which operates on objects that are functions, and returns objects that are also functions.

1. A simple example of a decorator:

Result analysis: from the output, we can see that after calling the decorator, the function testFunc has been implemented, the effect of "own code + original code".

two。 What if we want the type of function decorated by the decorator to be not fixed, that is, we want the function decorated by the decorator to be any function, so what should we do?

Answer: use empty interface because the Go language hollow interface is the foundation of generics.

Examples are as follows:

Result analysis: the existence of Go hollow interface makes the implementation of generics possible, and the implementation of a decorator function can support multiple types of functions. Through the test results, we can see that this function does work, and the annotation of 1Magne2Magne3re4 is an introduction to the implementation of the decorator. For the part of the decorator's own code, you can customize the implementation according to your own wishes.

3. What if we want to decorate the same function with different decorators?

The easiest thing to do is to implement multiple decorator functions separately, and then call them sequentially, as shown in the following example:

For the above code, when there are not many decorators, it can be tolerated, and when there are a lot of decorators, they will look very unattractive. In order to make them more elegant, we optimize them to look like the following.

Result analysis: from the result output, we can see that the effect of the two methods is the same, and the second method is obviously more elegant.

This is the end of the introduction to "the use of decorators in Go". Thank you for your reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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