How to use golang package

The steps to use Go language package are as follows: 1. Create a new package; 2. In the directory of the package, write the corresponding code file; 3. Start with a capital letter so that it can be used by other Import and use the package; 4. When you need to use the code in the package, use the form "import """ to import into the current code file; 5. Use the "."; 6. Use the Go command to build and run the program.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

Package using Go language is the basic unit for organizing and managing code.

The following are the general steps for using Go language packages:

1. Creating a package:

   First, you can create a new package. A package is usually stored in a separate directory named after the package. Package names should be descriptive and clearly express their functionality.

2. Write code:

   In the directory of the package, you can write the corresponding code file. A package can contain multiple code files, but only one file can be declared as package . This file is called the entry file of the package.

3. Exporting and encapsulation:

   The Go language uses case to control the visibility of code. Identifiers starting with uppercase letters can be imported and used by other packages and are called exported identifiers; identifiers starting with lowercase letters can only be used within the current package and are called private identifiers.

4. Import package:

   When you need to use the code in the package, you can introduce it into the current code file through the import statement. Use the form of import "". The package path can be a relative path or an absolute path.

5. Using code from a package:

   Once a package is imported, public identifiers from that package (i.e. starting with a capital letter) can be used in the current code file identifier). It can be accessed through ..

6. Build and run:

   When you have finished writing the code, you can use Go commands to build and run the program. You can use the go build command to compile a package or program and generate an executable file; use the go run command to run the program directly.

It should be noted that the import path of the package can point to the path of the local file system or the address of a remote warehouse (such as GitHub). At the same time, the Go language also provides an official standard library, which contains a large number of commonly used functions and tools, which can be imported and used through import "fmt" and other methods.

To summarize, the methods of using Go language packages include creating packages, writing code, exporting and encapsulating, importing packages, and using the code in the package. This can effectively organize and manage code and improve code reusability and maintainability.

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