How to build packages in Go?

The way to build a package in Go language is as follows: Create a package directory: mkdir [package name] & cd [package name] Create a package file: package.go and optional main.go Write code to compile the package: go build ( Optional) Installation package: go install For example, to use the math package, you need to go get math, import import "math" and call its function, such as fmt.Println(math.Abs(-10)).

How to build packages in the Go language

In the Go language, a package is a mechanism for organizing and distributing related code. To build a package, you need to complete the following steps:

1. Create the package directory

Use the mkdir command to create a new directory to contain your Package:

mkdir mypackage
cd mypackage

2. Create package file

Create the following file in the package directory:

• package.go : This is the main Go file of the package.
• main.go: Create this file if the package requires a main function to run.

3. Write code

Write your code in the package.go file. For example:

package mypackage

import "fmt"

func hello(name string) string {
    return fmt.Sprintf("Hello, %s!", name)
}

4. Compile the package

Use the go build command to compile the package:

go build

This will be in the current directory Create an archive named mypackage.a.

5. Install the package (optional)

If you want to use the package outside the current project, you need to install it to the pkg of GOPATH Directory:

go install

Practical case

Suppose you have a package named math, which contains some common mathematical functions . The package contains the following files:

• package.go:

  package math
  
  import "math"
  
  func Abs(x float64) float64 {
    return math.Abs(x)
  }

• main.go :

  package main
  
  import "fmt"
  import "math"
  
  func main() {
    fmt.Println(math.Abs(-10)) // 输出: 10
  }

To use the math package you need to perform the following steps:

1. Use go get Download the package:

   go get math

2. Import the package in your code:

   import "math"

3. Call the functions in the package:

   fmt.Println(math.Abs(-10)) // 输出: 10

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