Struct

Anonymous Struct

monica := struct {
        firstName, lastName string
        salary              int
        fullTime            bool
    }{
        firstName: "Monica",
        lastName:  "Geller",
        salary:    1200,
    }

    fmt.Println(monica)

Anonymous Field

type Data struct {
    test string
    int
    bool
}

func main() {
    sample1 := Data{"Monday", 1200, true}
    sample1.bool = false

    fmt.Println(sample1.test, sample1.int, sample1.bool) // note that sample1.string will raise error
}

Tag

Tags are formatted as concatenation of key:"value" pairs.

(Un)marshaling;

import (
    "encoding/json"
    "fmt"
)
func main() {
    type T struct {
       F1 int `json:"f_1"`
       F2 int `json:"f_2,omitempty"`
       F3 int `json:"f_3,omitempty"`
       F4 int `json:"-"`
    }
    t := T{1, 0, 2, 3}
    b, err := json.Marshal(t)
    if err != nil {
        panic(err)
    }
    fmt.Printf("%s\n", b) // {"f_1":1,"f_3":2}
}

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Last update: February 2, 2021