golang函数在面向对象编程中的性能优化

func genAdder(x int) func(int) int {
    return func(y int) int {
        return x + y
    }
}

adder1 := genAdder(1)
adder2 := genAdder(2)

// adder1 和 adder2 都会捕获变量 x
fmt.Println(adder1(1)) // 输出：2
fmt.Println(adder2(1)) // 输出：3

func genAdder(x int) func(y int) int {
    return func(y int) int {
        return x + y
    }
}

adder1 := genAdder(1)
adder2 := genAdder(2)

// adder1 和 adder2 不再捕获变量 x
fmt.Println(adder1(1)) // 输出：2
fmt.Println(adder2(1)) // 输出：3

type Person struct {
    name string
}

func (p *Person) GetName() string {
    return p.name
}

func main() {
    // 调用 GetName 方法来获取名称
    person := Person{"Alice"}
    fmt.Println(person.GetName()) // 输出：Alice
}

type Person struct {
    name string
}

func main() {
    // 直接访问结构体字段
    person := Person{"Alice"}
    fmt.Println(person.name) // 输出：Alice
}

// 计算一组数字的总和
func sum(numbers []int) int {
    sum := 0
    for _, num := range numbers {
        sum += num
    }
    return sum
}

func main() {
    // 创建要计算其总和的数字列表
    numbers := []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}

    // 串行计算总和
    start := time.Now()
    serialSum := sum(numbers)
    fmt.Println("Serial sum:", serialSum)
    fmt.Println("Serial time:", time.Since(start))

    // 并行计算总和
    start = time.Now()
    var wg sync.WaitGroup
    wg.Add(len(numbers))
    partialSums := make(chan int, len(numbers))
    for _, num := range numbers {
        go func(num int) {
            defer wg.Done()
            partialSums <- sum([]int{num})
        }(num)
    }
    go func() {
        wg.Wait()
        close(partialSums)
    }()
    concurrentSum := 0
    for partialSum := range partialSums {
        concurrentSum += partialSum
    }
    fmt.Println("Concurrent sum:", concurrentSum)
    fmt.Println("Concurrent time:", time.Since(start))
}

Serial sum: 55
Serial time: 1.00424998ms
Concurrent sum: 55
Concurrent time: 721.9786371ms