Golang如何使用range遍历_Go range遍历规则与坑点解释

for index, value := range slice {
    // 处理 index 和 value
}

nums := []int{10, 20, 30}
for i, v := range nums {
    fmt.Println(i, v) // 输出: 0 10, 1 20, 2 30
}

var wg sync.WaitGroup
nums := []int{1, 2, 3}
for i, v := range nums {
    wg.Add(1)
    go func() {
        defer wg.Done()
        fmt.Println("index:", i, "value:", v)
    }()
}
wg.Wait()

for i, v := range nums {
    wg.Add(1)
    go func(idx int, val int) {
        defer wg.Done()
        fmt.Println("index:", idx, "value:", val)
    }(i, v)
}

for i, v := range nums {
    i, v := i, v // 创建新的同名变量
    wg.Add(1)
    go func() {
        defer wg.Done()
        fmt.Println("index:", i, "value:", v)
    }()
}

m := map[string]int{"a": 1, "b": 2, "c": 3}
for k, v := range m {
    fmt.Println(k, v)
}

keys := make([]string, 0, len(m))
for k := range m {
    keys = append(keys, k)
}
sort.Strings(keys)
for _, k := range keys {
    fmt.Println(k, m[k])
}

str := "你好"
for i, r := range str {
    fmt.Printf("index: %d, rune: %c\n", i, r)
}

for i, b := range []byte(str) {
    fmt.Printf("byte index: %d, byte: %x\n", i, b)
}