Read it in one article: What are the class libraries that must be mastered in Go language?

As an increasingly popular programming language, Go language has a rich class library for developers to use. When learning and using the Go language, it is very important to master some commonly used class libraries. This article will introduce some class libraries that must be mastered in the Go language, with specific code examples to facilitate readers to better understand and apply them.

1. Standard library

1. fmt

fmt library is a commonly used output formatting library in the Go language standard library, which can be used for output Various data types.

package main

import "fmt"

func main() {
    fmt.Println("Hello, World!")
}

2. os

os The library provides an interface to operating system functions and can be used to operate files and directories.

package main

import (
    "os"
    "fmt"
)

func main() {
    file, err := os.Create("test.txt")
    if err != nil {
        fmt.Println(err)
        return
    }

    defer file.Close()
    file.WriteString("Hello, File!")
}

2. Network library

1. net/http

net/http package is used to implement HTTP clients and servers in Go language class library.

package main

import (
    "net/http"
    "fmt"
)

func handler(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "Hello, HTTP!")
}

func main() {
    http.HandleFunc("/", handler)
    http.ListenAndServe(":8080", nil)
}

3. Database library

1. database/sql

database/sql package provides a common interface for database access, which can be used to connect and operate various databases.

package main

import (
    "database/sql"
    _ "github.com/go-sql-driver/mysql"
)

func main() {
    db, err := sql.Open("mysql", "user:password@tcp(localhost:3306)/dbname")
    if err != nil {
        println(err)
        return
    }

    defer db.Close()
}

4. Concurrency library

1. The sync

sync package provides synchronization primitives that can be used to control concurrent access.

package main

import (
    "sync"
    "fmt"
)

func main() {
    var wg sync.WaitGroup
    wg.Add(1)

    go func() {
        defer wg.Done()
        fmt.Println("Hello, Concurrency!")
    }()

    wg.Wait()
}

By learning and mastering some of the necessary class libraries introduced above, developers can help developers better program and develop in the Go language. Of course, in addition to these class libraries, the Go language has many other excellent class libraries and third-party packages, which can be selected and learned according to specific needs. I hope this article can help you better understand and use class libraries in Go language.

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