Golang结构体指针切片操作技巧

<span style="color:blue;">type</span> Person <span style="color:blue;">struct</span> {
    Name <span style="color:blue;">string</span>
    Age  <span style="color:blue;">int</span>
}

<span style="color:green;">// 声明并初始化结构体指针切片</span>
var people []*Person
people = append(people, &Person{Name: "Alice", Age: 30})

<span style="color:blue;">for</span> _, p := <span style="color:blue;">range</span> people {
    <span style="color:blue;">if</span> p.Name == "Alice" {
        p.Age = 31  <span style="color:green;">// 直接修改原结构体字段</span>
    }
}

persons := make([]*Person, 5)  <span style="color:green;">// 长度为5，但每个元素是nil</span>
<span style="color:blue;">for</span> i := <span style="color:#8B0000;">0</span>; i < len(persons); i++ {
    persons[i] = &Person{Name: fmt.Sprintf("User%d", i), Age: 20 + i}
}

<span style="color:blue;">for</span> _, p := <span style="color:blue;">range</span> persons {
    <span style="color:blue;">if</span> p != nil {
        fmt.Println(p.Name)
    }
}

<span style="color:blue;">func</span> updateAges(people []*Person) {
    <span style="color:blue;">for</span> _, p := <span style="color:blue;">range</span> people {
        p.Age++
    }
}