How to create a custom package in Go language?

Creating custom packages in the Go language enables code reuse and modularization. Here are the steps: Create a workspace. Create a package directory and file (named mypackage.go). Write the package code and compile it (go build -o mypackage.a mypackage.go). Import the package in the main application (import "./mypackage").

How to Create a Custom Package in Go Language: A Step-by-Step Guide

Creating a Custom Package in Go Language Can Help You manage and organize project code to achieve code reuse and modularization. Below is a step-by-step guide to creating a custom package, along with a practical example for reference.

Step 1: Create a new workspace

First, create a new workspace to store your custom package. Use the following command:

mkdir gopackage
cd gopackage

Step 2: Create package directory and files

In the workspace, create a directory named mypackage, It will contain the package code. In the directory, create a file named mypackage.go.

Step 3: Write the package code

The mypackage.go file will contain the code for the package. Use the following code example:

package mypackage

// Greeting 函数用于打印问候语
func Greeting(name string) {
    fmt.Printf("你好，%s！\n", name)
}

Step 4: Compile the package

Compile the package using the following command:

go build -o mypackage.a mypackage.go

After compilation, mypackage. a files will be generated in the gopackage directory.

Step 5: Create a main application that imports the package

In the gopackage workspace, create a new file main. go as the main application.

package main

import (
    "fmt"
    "./mypackage" // 导入自定义包
)

func main() {
    mypackage.Greeting("世界")
}

Practical case: Calculate the sum of two integers

Follow the same steps as above and create a custom packagemathpkg to calculate the sum of two integers The sum of integers.

mathpkg/sum.go

package mathpkg

// Sum 函数返回两个整数的总和
func Sum(a, b int) int {
    return a + b
}

Main application

package main

import (
    "fmt"
    "mathpkg"
)

func main() {
    fmt.Println(mathpkg.Sum(10, 20))
}

Compile and run the main application and you will see to the following output:

30

Through this practical case, you can learn how to use custom packages for code reuse and modularization in the Go language.

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