Golang Beginner's Guide to Clearing Up Doubts: From Zero Basics to Practice

Frequently asked questions for beginners in Golang include basics such as installing and writing your first program, as well as advanced concepts such as variable types, data structures, control flow, function declarations, concurrency and exception handling. In practical cases, common problems include writing HTTP servers and reading and writing files. Beginners can improve their understanding of Golang by practicing and solving real-world problems.

Golang Beginner’s Guide to Clearing Up Doubts: From Zero Basics to Practice

As a Golang beginner, you may encounter some common problems. This guide aims to clear up your doubts and make your Golang journey smoother.

Basic knowledge

• Install Golang: https://go.dev/doc/install
• Write the first Program: package main; func main() { fmt.Println("Hello, world!") }
• Variable type: int, float64, string, bool

Data structure

• Array: var arr [5]int
• Slice: slice := []int{1, 2, 3}
• ##Map: map := map[string] int{"a": 1, "b": 2}

• Conditional statement: if /else, switch/case
• Loop: for, while
• Exception handling: try/catch/finally

• Declaration function: func functionName(parameters) returnValues
• Parameters and return values: Use type annotations, such as func sum(a int, b int) int
• Anonymous function: func() {}

• Coroutine: go func() {}
• Channel: chan Used to communicate between coroutines
• Mutex lock: mutex Used to synchronize access to shared resources

Write a simple HTTP server:

package main

import (
    "fmt"
    "net/http"
)

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        fmt.Fprintf(w, "Hello, world!")
    })

    http.ListenAndServe(":8080", nil)
}

Reading and writing files:

package main

import (
    "fmt"
    "io/ioutil"
)

func main() {
    data, err := ioutil.ReadFile("myfile.txt")
    if err != nil {
        fmt.Println(err)
    }
    fmt.Println(string(data))
}

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