Video source ：B standing 《golang Introduction to project practice [2021 newest Go Language course , There is no nonsense , Dry only ！ Ongoing update ...]》

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Uninitialized structure , Members are all zero values int 0 flow 0.0 bool false string nil nil

example

package main

import "fmt"

func main() {
    type Person struct {
        id, age     int
        name, email string
    }

    var tom Person
    fmt.Printf("tom: %v\n", tom)
}

Running results

[Running] go run "d:\SynologyDrive\ software development \go\golang Introduction to project practice \goproject\360duote.com\pro01\test.go"
tom: {0 0  }

Initialize the structure with key value pairs

example

package main

import "fmt"

func main() {
    type Person struct {
        id, age     int
        name, email string
    }

    kite := Person{
        id:    1,
        name:  "kite",
        age:   20,
        email: "[email protected]",
    }

    fmt.Printf("kite: %v\n", kite)
}

Running results

[Running] go run "d:\SynologyDrive\ software development \go\golang Introduction to project practice \goproject\360duote.com\pro01\test.go"
kite: {1 20 kite [email protected]}

Initialize with a list of values

example

package main

import "fmt"

func main() {
    type Person struct {
        id, age     int
        name, email string
    }

    kite := Person{
        1,
        20,
        "kite",
        "[email protected]",
    }

    fmt.Printf("kite: %v\n", kite)
}

Running results

[Running] go run "d:\SynologyDrive\ software development \go\golang Introduction to project practice \goproject\360duote.com\pro01\test.go"
kite: {1 20 kite [email protected]}

Be careful ：

1. All fields of the structure must be initialized .
2. The initial values must be filled in the same order as the fields are declared in the structure .
3. This method cannot be mixed with the key initialization method .

Initialization of some members

Unused members , It can be done without initialization

package main

import "fmt"

func main() {
    type Person struct {
        id, age     int
        name, email string
    }

    kite := Person{
        id:   1,
        name: "kite",
    }

    fmt.Printf("kite: %v\n", kite)
}

Running results

[Running] go run "d:\SynologyDrive\ software development \go\golang Introduction to project practice \goproject\360duote.com\pro01\test.go"
kite: {1 0 kite }