Code sample sharing in the golang function community

1. The Golang function community provides code examples, including basic functions and practical cases. 2. Basic function: Compare string acquisition time 3. Practical case: Read and process CSV files to send emails

Code sample sharing in the Golang function community

Introduction

The Golang function community is an active ecosystem that provides a variety of code samples to help developers solve common problems and create efficient applications . This article will share some useful code examples, including practical examples, to show these codes in action.

Basic functions

• Compare strings:

  package main
  
  import (
    "fmt"
    "strings"
  )
  
  func main() {
    s1 := "hello"
    s2 := "HELLO"
  
    if s1 == s2 {
        fmt.Println("Strings are equal")
    } else {
        fmt.Println("Strings are not equal")
    }
  
    if strings.EqualFold(s1, s2) {
        fmt.Println("Strings are equal (case-insensitive)")
    }
  }

• Acquisition time:

  package main
  
  import (
    "fmt"
    "time"
  )
  
  func main() {
    now := time.Now()
  
    fmt.Println("Current time:", now)
    fmt.Println("Current timestamp:", now.Unix())
  }

Practical case

Reading and processing CSV files

The following code example demonstrates how to read and process a CSV file using the encoding/csv package:

package main

import (
    "encoding/csv"
    "fmt"
    "os"
)

func main() {
    f, err := os.Open("data.csv")
    if err != nil {
        fmt.Println(err)
        return
    }
    defer f.Close()

    r := csv.NewReader(f)
    r.Comma = ';' // Set different comma if needed

    for {
        record, err := r.Read()
        if err == io.EOF {
            break
        }
        if err != nil {
            fmt.Println(err)
            continue
        }

        fmt.Println(record)
    }
}

Send an email

The following code Example showing how to send an email using the net/smtp package:

package main

import (
    "fmt"
    "log"
    "net/smtp"
)

func main() {
    // Set up SMTP server and authentication
    host := "smtp.example.com"
    port := 587
    user := "username"
    password := "password"

    // Create message
    from := "from@example.com"
    to := []string{"to@example.com"}
    subject := "Test Email"
    body := "This is a test email."

    msg := "From: " + from + "\n" +
        "To: " + strings.Join(to, ",") + "\n" +
        "Subject: " + subject + "\n" +
        "\n" + body

    // Connect to SMTP server
    addr := fmt.Sprintf("%s:%d", host, port)
    auth := smtp.PlainAuth("", user, password, host)
    c, err := smtp.Dial(addr)
    if err != nil {
        log.Fatal(err)
    }

    // Send email
    if err := c.StartTLS(nil); err != nil {
        log.Fatal(err)
    }
    if err := c.Auth(auth); err != nil {
        log.Fatal(err)
    }
    if err := c.Mail(from); err != nil {
        log.Fatal(err)
    }

    for _, addr := range to {
        if err := c.Rcpt(addr); err != nil {
            log.Fatal(err)
        }
    }

    w, err := c.Data()
    if err != nil {
        log.Fatal(err)
    }
    if _, err := w.Write([]byte(msg)); err != nil {
        log.Fatal(err)
    }
    w.Close()

    // Quit the SMTP server
    c.Quit()
}

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