Golang 開発者が直面する一般的な問題を解決するための重要なガイド

package main

import (
    "fmt"
    "sync"
)

var count int
var mutex sync.Mutex

func increment() {
    mutex.Lock()
    defer mutex.Unlock()
    count++
}

func main() {
    var wg sync.WaitGroup
    for i := 0; i < 1000; i++ {
        wg.Add(1)
        go func() {
            defer wg.Done()
            increment()
        }()
    }
    wg.Wait()
    fmt.Println("Final Count:", count)
}

package main

import (
    "log"
    "net/http"
    _ "net/http/pprof"
)

func handler(w http.ResponseWriter, r *http.Request) {
    for i := 0; i < 10000; i++ {
        // 进行大量内存分配操作
        _ = make([]byte, 1024)
    }
    w.Write([]byte("Hello World"))
}

func main() {
    go func() {
        log.Println(http.ListenAndServe("localhost:6060", nil))
    }()
    http.HandleFunc("/", handler)
    http.ListenAndServe(":8080", nil)
}

package main

import (
    "errors"
    "fmt"
)

func divide(a, b int) (int, error) {
    if b == 0 {
        return 0, errors.New("division by zero")
    }
    return a / b, nil
}

func main() {
    defer func() {
        if r := recover(); r != nil {
            fmt.Println("Recovered:", r)
        }
    }()
    
    result, err := divide(6, 0)
    if err != nil {
        panic(err)
    }
    
    fmt.Println("Result:", result)
}