douchuitang0331 2015-12-09 06:21
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如何从Golang中的结构数组中检索元素数组?

I am new to golang, and got stuck at this. I have an array of structure:

Users []struct {
   UserName string 
   Category string
   Age string
}

I want to retrieve all the UserName from this array of structure. So, output would be of type:

UserList []string 

I know the brute force method of using a loop to retrieve the elements manually and constructing an array from that. Is there any other way to do this?

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  • doude4924 2015-12-09 08:38
    关注

    Nope, loops are the way to go.

    Here's a working example.

    package main
    
    import "fmt"
    
    type User struct {
        UserName string
        Category string
        Age      int
    }
    
    type Users []User
    
    func (u Users) NameList() []string {
        var list []string
        for _, user := range u {
            list = append(list, user.UserName)
        }
        return list
    }
    
    func main() {
        users := Users{
            User{UserName: "Bryan", Category: "Human", Age: 33},
            User{UserName: "Jane", Category: "Rocker", Age: 25},
            User{UserName: "Nancy", Category: "Mother", Age: 40},
            User{UserName: "Chris", Category: "Dude", Age: 19},
            User{UserName: "Martha", Category: "Cook", Age: 52},
        }
    
        UserList := users.NameList()
    
        fmt.Println(UserList)
    }
    
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