Golang 初心者向けの質問集: よくある問題を解決し、改善に向けて進む

type Person struct {
  Name string
  Age  int
}

p := Person{"John Doe", 30}

m := make(map[string]int)
m["Alice"] = 10
m["Bob"] = 20

fmt.Println(m["Alice"]) // 输出: 10

func sumAll(numbers ...int) int {
  total := 0
  for _, num := range numbers {
    total += num
  }
  return total
}

result := sumAll(1, 2, 3, 4, 5) // result = 15

f, err := os.Open("test.txt")
if err != nil {
  panic(err)
}
defer f.Close()

_, err = f.Write([]byte("Hello, world!"))
if err != nil {
  panic(err)
}

b := make([]byte, 10)
_, err = f.Read(b)
if err != nil {
  panic(err)
}
fmt.Println(string(b)) // 输出: "Hello, wo"

func concurrentFunc(i int) {
  fmt.Println(i)
}

for i := 0; i < 5; i++ {
  go concurrentFunc(i)
}
// 同时输出 0、1、2、3、4

type Task struct {
  ID   int
  Name string
  Desc string
}

tasks := make([]Task, 0)

func createTask(w http.ResponseWriter, r *http.Request) {
  var task Task
  if err := json.NewDecoder(r.Body).Decode(&task); err != nil {
    http.Error(w, "Invalid JSON", http.StatusBadRequest)
    return
  }

  tasks = append(tasks, task)
  fmt.Fprint(w, "Task created successfully")
}

func getTasks(w http.ResponseWriter, r *http.Request) {
  enc := json.NewEncoder(w)
  if err := enc.Encode(tasks); err != nil {
    http.Error(w, "Failed to encode tasks", http.StatusInternalServerError)
    return
  }
}