How to correctly introduce custom packages when learning Go language by yourself?

The correct way to introduce Go language custom packages

During the Go language learning process, the introduction of custom packages often plagues beginners. This article provides detailed solutions to the problem of failed introduction of custom packages, focusing on explaining the correct use of Go Modules.

Many students will encounter problems that custom packages cannot be introduced correctly when learning Go. The main reason is that they lack understanding of the Go Modules mechanism. Go Modules provides a standardized package management method that requires strict compliance with its rules to properly introduce custom packages.

Step 1: Initialize the Go Module

In the root directory of your project, initialize a Go Module with the following command:

go mod init myproject

Replace myproject with the name of your project. This creates a go.mod file that is used to manage project dependencies.

Step 2: Correctly introduce custom packages

Suppose your custom package is named calc and is located in the calc folder under the project directory. In your main program, use the import statement to import the package:

package main

import (
    "fmt"
    "myproject/calc" // Pay attention to the path)

func main() {
    fmt.Println(calc.Add2(1, 2, 3, 4)) // Call custom function}

Key: Path issues

The path myproject myproject/calc in import "myproject/calc" must accurately reflect the relative position of your custom package in the project. myproject is the module name you initialized in the first step.

Step 3: Update the dependency

After modifying the code, run the following command to update the dependency information in the go.mod file:

go mod tidy

This command analyzes your code and updates the go.mod and go.sum files to ensure that all dependencies are correctly declared and verified.

Step 4: Run the program

Finally, run your Go program:

go run main.go

Through the above steps, you can successfully introduce and use your custom package. Understanding and proficient in using Go Modules is the key to Go language development. It can effectively manage project dependencies and avoid package introduction errors.

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