Go language learning guide: including essential knowledge and practical skills

The Go language learning guide covers basic to advanced concepts and consolidates understanding through practical cases. Prerequisite knowledge includes variables, control statements, functions, interfaces, and concurrency. Practical tips include dependency management, formatted input/output, error handling, and web application building. Practical cases demonstrate command line programs, web servers, and concurrency performance improvements.

Go Language Learning Guide: Including essential knowledge and practical skills

Introduction

Go is a modern programming language known for its simplicity, high performance and concurrency. This guide will take you on a journey to learn the Go language, covering everything from basics to advanced concepts, and solidifying your understanding through practical cases.

Required knowledge

• Variables and data types
• Control flow statements
• Functions and methods
• Interfaces and Abstractions
• Concurrency and Channels

Practical Tips

• Use Go Modules to manage dependencies
• Use fmt package for formatted input/output
• Use error handling mechanism to handle errors
• Build web-based applications
• Use Go for concurrent programming

Practical case

Build a simple command line program

package main

import (
    "fmt"
    "os"
)

func main() {
    name := os.Getenv("NAME")
    if name == "" {
        name = "World"
    }

    fmt.Printf("Hello, %s! How are you doing today?\n", name)
}

Create a simple Web server

package main

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

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

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

Use concurrency to improve performance

package main

import (
    "fmt"
    "sync"
)

var wg sync.WaitGroup

func sum(array []int, ch chan<- int) {
    sum := 0
    for _, v := range array {
        sum += v
    }

    wg.Done()
    ch <- sum
}

func main() {
    array := []int{1, 2, 3, 4, 5}
    ch := make(chan int)

    for i := 0; i < len(array); i++ {
        wg.Add(1)
        go sum(array[i:], ch)
    }

    var result int
    for i := 0; i < len(array); i++ {
        result += <-ch
    }

    wg.Wait()
    fmt.Println("The sum is", result)
}

Learning the Go language is a step-by-step process. By following this guide, practicing real-world examples, and delving into the Go language documentation, you will continue to improve your skills and become a skilled Go programmer.

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